Improve tests embebbing

[Vladyslav-Kuksiuk]

This PR improves pattern-based embedding by adding explicit multi-line matching for start, end and line patterns. Instead of requiring a single source line to identify a fragment boundary, patterns can now use \n to match consecutive source lines.

For example:

<embed-code
  file="$test/JunitTest.java"
  start="Test \n adds two values"
  end="assertEquals(2, value); \n }"
/>
```java
@Test
@DisplayName("adds two values")
void addsTwoValues() {
    int value = 1 + 1;

    assertEquals(2, value);
}
```

Each line in a multi-line pattern follows the same glob rules as regular one-line patterns, including ^ and $ for exact matching.

Spaces around \n are ignored.

Additional change: added possibility to write quote characters in patterns as \" instead of the XML entity ".

Resolves #44.

[dmytro-kashcheiev]

@Vladyslav-Kuksiuk LGTM with minor comment.

[Copilot]

Pull request overview

This PR extends embed-code’s glob-based matching to support multi-line start/end/line patterns separated by \n, and adds support for writing quotes in XML attributes as \" (converted to " internally). It updates documentation and adds new test fixtures + test cases to validate the behavior.

Changes:

• Add multi-line pattern parsing/matching for start, end, and line patterns using \n separators (with \\n for literal \n text).
• Allow backslash-escaped quotes (\") in <embed-code ...> XML attributes by converting them to " before XML unmarshalling.
• Add new embedding/parsing tests and documentation examples; bump version to 1.2.1.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
embedding/parsing/pattern.go	Adds multi-line pattern splitting and matching helpers.
embedding/parsing/instruction.go	Implements multi-line matching for line, and multi-line-aware start/end matching.
embedding/parsing/xml_parse.go	Preprocesses \" into " prior to xml.Unmarshal.
embedding/parsing/instruction_test.go	Adds tests for \" parsing and literal glob-character escaping.
embedding/embedding_test.go	Adds end-to-end embedding tests covering multi-line patterns and literal \\n matching.
EMBEDDING.md	Documents multi-line patterns and escaping rules (including \").
test/resources/docs/escaped-newline-pattern.md	New doc fixture for multi-line start/end patterns.
test/resources/docs/escaped-newline-exact-pattern.md	New doc fixture for exact (^...$) multi-line patterns.
test/resources/docs/escaped-newline-line-pattern.md	New doc fixture for multi-line line patterns.
test/resources/docs/escaped-newline-literal-pattern.md	New doc fixture for matching literal \\n text.
test/resources/code/java/org/example/MultiLinePatternSample.java	New code fixture used by multi-line pattern embedding tests.
test/resources/code/java/literal-patterns.txt	New text fixture for literal wildcard/caret/dollar matching tests.
main.go	Bumps application version to 1.2.1.

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