add python script to generate variable-large test file

tests/files/.gitignore

@@ -0,0 +1 @@
+big*.tsql

tests/files/generate_big.py

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+import hashlib
+from typing import IO
+
+def number_to_string(number: int) -> str:
+    byte_representation = number.to_bytes((number.bit_length() + 7) // 8, 'big')
+
+    hash_object = hashlib.sha256(byte_representation)
+    hash_value = hash_object.digest()
+
+    letters = [chr((byte % 26) + ord('A')) for byte in hash_value]
+    hash_string = ''.join(letters)
+
+    return hash_string
+
+def write_table(file: IO[bytes], fields: int, number: int) -> None:
+    datatypes = ["int", "double", "varchar(100)", "char(6)", "uuid"]
+
+    fields = [f"\t{datatypes[i % len(datatypes)]} {number_to_string(i + 100)},\n" for i in range(fields)]
+
+    lines = ["@primary_key(id)\n", f"table {number_to_string(number)} " + "{\n", "\tint id,\n" ]
+    lines.extend(fields)
+    lines.extend(["};\n"])
+
+    file.writelines(lines)
+
+if __name__ == "__main__":
+    file_name = "big.tsql"
+
+    with open(file_name, "w") as file:
+        tables = 1_000
+        fields = 500
+
+        for i in range(1, tables):
+            write_table(file, fields, i);