feat: convert containers for tabular data to HTML (#243)

Closes #140.

### Summary of Changes

Add method `to_html` to `Table`, `Column`, and `Row` that returns an
HTML representation of the respective container.

src/safeds/data/tabular/containers/_column.py

@@ -530,6 +530,30 @@ def plot_histogram(self) -> Image:
         buffer.seek(0)
         return Image(buffer, ImageFormat.PNG)
 
+    # ------------------------------------------------------------------------------------------------------------------
+    # Conversion
+    # ------------------------------------------------------------------------------------------------------------------
+
+    def to_html(self) -> str:
+        """
+        Return an HTML representation of the column.
+
+        Returns
+        -------
+        output : str
+            The generated HTML.
+
+        Examples
+        --------
+        >>> from safeds.data.tabular.containers import Column
+        >>> column = Column("test", [1, 2, 3])
+        >>> html = column.to_html()
+        """
+        frame = self._data.to_frame()
+        frame.columns = [self.name]
+
+        return frame.to_html(max_rows=self._data.size, max_cols=1)
+
     # ------------------------------------------------------------------------------------------------------------------
     # IPython integration
     # ------------------------------------------------------------------------------------------------------------------

src/safeds/data/tabular/containers/_row.py

@@ -454,6 +454,23 @@ def to_dict(self) -> dict[str, Any]:
         """
         return {column_name: self.get_value(column_name) for column_name in self.column_names}
 
+    def to_html(self) -> str:
+        """
+        Return an HTML representation of the row.
+
+        Returns
+        -------
+        output : str
+            The generated HTML.
+
+        Examples
+        --------
+        >>> from safeds.data.tabular.containers import Row
+        >>> row = Row({"a": 1, "b": 2})
+        >>> html = row.to_html()
+        """
+        return self._data.to_html(max_rows=1, max_cols=self._data.shape[1])
+
     # ------------------------------------------------------------------------------------------------------------------
     # IPython integration
     # ------------------------------------------------------------------------------------------------------------------

src/safeds/data/tabular/containers/_table.py

@@ -1236,6 +1236,23 @@ def to_dict(self) -> dict[str, list[Any]]:
         """
         return {column_name: list(self.get_column(column_name)) for column_name in self.column_names}
 
+    def to_html(self) -> str:
+        """
+        Return an HTML representation of the table.
+
+        Returns
+        -------
+        output : str
+            The generated HTML.
+
+        Examples
+        --------
+        >>> from safeds.data.tabular.containers import Table
+        >>> table = Table.from_dict({"a": [1, 2, 3], "b": [4, 5, 6]})
+        >>> html = table.to_html()
+        """
+        return self._data.to_html(max_rows=self._data.shape[0], max_cols=self._data.shape[1])
+
     def to_columns(self) -> list[Column]:
         """
         Return a list of the columns.

tests/safeds/data/tabular/containers/test_column.py

@@ -3,6 +3,52 @@
 from safeds.data.tabular.containers import Column
 
 
+class TestToHtml:
+    @pytest.mark.parametrize(
+        "column",
+        [
+            Column("a", []),
+            Column("a", [1, 2, 3]),
+        ],
+        ids=[
+            "empty",
+            "non-empty",
+        ],
+    )
+    def test_should_contain_table_element(self, column: Column) -> None:
+        pattern = r"<table.*?>.*?</table>"
+        assert re.search(pattern, column.to_html(), flags=re.S) is not None
+
+    @pytest.mark.parametrize(
+        "column",
+        [
+            Column("a", []),
+            Column("a", [1, 2, 3]),
+        ],
+        ids=[
+            "empty",
+            "non-empty",
+        ],
+    )
+    def test_should_contain_th_element_for_column_name(self, column: Column) -> None:
+        assert f"<th>{column.name}</th>" in column.to_html()
+
+    @pytest.mark.parametrize(
+        "column",
+        [
+            Column("a", []),
+            Column("a", [1, 2, 3]),
+        ],
+        ids=[
+            "empty",
+            "non-empty",
+        ],
+    )
+    def test_should_contain_td_element_for_each_value(self, column: Column) -> None:
+        for value in column:
+            assert f"<td>{value}</td>" in column.to_html()
+
+
 class TestReprHtml:
     @pytest.mark.parametrize(
         "column",

tests/safeds/data/tabular/containers/test_row.py

@@ -402,6 +402,53 @@ def test_should_return_dict_for_table(self, row: Row, expected: dict[str, Any])
         assert row.to_dict() == expected
 
 
+class TestToHtml:
+    @pytest.mark.parametrize(
+        "row",
+        [
+            Row(),
+            Row({"a": 1, "b": 2}),
+        ],
+        ids=[
+            "empty",
+            "non-empty",
+        ],
+    )
+    def test_should_contain_table_element(self, row: Row) -> None:
+        pattern = r"<table.*?>.*?</table>"
+        assert re.search(pattern, row.to_html(), flags=re.S) is not None
+
+    @pytest.mark.parametrize(
+        "row",
+        [
+            Row(),
+            Row({"a": 1, "b": 2}),
+        ],
+        ids=[
+            "empty",
+            "non-empty",
+        ],
+    )
+    def test_should_contain_th_element_for_each_column_name(self, row: Row) -> None:
+        for column_name in row.column_names:
+            assert f"<th>{column_name}</th>" in row.to_html()
+
+    @pytest.mark.parametrize(
+        "row",
+        [
+            Row(),
+            Row({"a": 1, "b": 2}),
+        ],
+        ids=[
+            "empty",
+            "non-empty",
+        ],
+    )
+    def test_should_contain_td_element_for_each_value(self, row: Row) -> None:
+        for value in row.values():
+            assert f"<td>{value}</td>" in row.to_html()
+
+
 class TestReprHtml:
     @pytest.mark.parametrize(
         "row",

tests/safeds/data/tabular/containers/test_table.py

@@ -54,6 +54,54 @@ def test_should_return_dict_for_table(self, table: Table, expected: dict[str, li
         assert table.to_dict() == expected
 
 
+class TestToHtml:
+    @pytest.mark.parametrize(
+        "table",
+        [
+            Table.from_dict({}),
+            Table.from_dict({"a": [1, 2], "b": [3, 4]}),
+        ],
+        ids=[
+            "empty",
+            "non-empty",
+        ],
+    )
+    def test_should_contain_table_element(self, table: Table) -> None:
+        pattern = r"<table.*?>.*?</table>"
+        assert re.search(pattern, table.to_html(), flags=re.S) is not None
+
+    @pytest.mark.parametrize(
+        "table",
+        [
+            Table.from_dict({}),
+            Table.from_dict({"a": [1, 2], "b": [3, 4]}),
+        ],
+        ids=[
+            "empty",
+            "non-empty",
+        ],
+    )
+    def test_should_contain_th_element_for_each_column_name(self, table: Table) -> None:
+        for column_name in table.column_names:
+            assert f"<th>{column_name}</th>" in table.to_html()
+
+    @pytest.mark.parametrize(
+        "table",
+        [
+            Table.from_dict({}),
+            Table.from_dict({"a": [1, 2], "b": [3, 4]}),
+        ],
+        ids=[
+            "empty",
+            "non-empty",
+        ],
+    )
+    def test_should_contain_td_element_for_each_value(self, table: Table) -> None:
+        for column in table.to_columns():
+            for value in column:
+                assert f"<td>{value}</td>" in table.to_html()
+
+
 class TestReprHtml:
     @pytest.mark.parametrize(
         "table",