Add regression tests for issue #361 (empty lines after table headers)

[rjwalters]

Summary

This PR adds comprehensive regression tests for issue #361, which reported that ktoml failed to parse valid TOML files with empty lines after table headers.

Background

Issue #361 reported parsing failures when empty lines appeared after TOML table headers (a pattern found in popular Python projects like FastAPI and Black). For example:

[project.optional-dependencies] standard = [ "fastapi-cli[standard] >=0.0.8", "httpx >=0.23.0" ]

This is valid TOML 1.0, but was previously causing MissingRequiredPropertyException in ktoml 0.7.1.

Resolution

✅ All regression tests pass on the current main branch, indicating the issue has been resolved.

The fix likely came through one of these recent PRs:

• Support decoding map with array #353 - Support decoding map with array
• Fix parsing of dotted keys inside array-of-tables #334 - Fix behavior of dotted keys inside array-of-tables
• Fixes around comments in/around multiline strings #333 - Fixes around comments in/around multiline strings

Test Coverage

This PR adds two test files with comprehensive coverage:

Issue361Test.kt (JVM-specific tests)

1. testFastAPIWithEmptyLineAfterTableHeader - Exact FastAPI pyproject.toml pattern
2. testMultipleEmptyLinesAfterTableHeader - Multiple consecutive empty lines
3. testEmptyLinesWithCommentsAfterTableHeader - Empty lines mixed with comments
4. testNestedTableWithEmptyLineAfterHeader - Deeply nested tables

RealWorldPythonProjectTest.kt (Cross-platform tests)

1. testFastAPIStyleEmptyLineAfterTableHeader - Parser-level validation
2. testEmptyLineAfterTableHeader - Minimal reproduction case
3. testMultipleEmptyLinesAfterTableHeader - Edge case coverage

Testing

All tests pass:

✓ 7 new regression tests ✓ All existing tests continue to pass ✓ No regressions introduced 

Impact

These regression tests ensure that:

• The fix for TOML parsing fails on valid pyproject.toml files from popular Python projects #361 remains stable in future releases
• ktoml continues to correctly parse real-world pyproject.toml files from popular Python projects
• TOML 1.0 spec compliance is maintained for empty lines after table headers

Closes #361

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🤖 Generated with Claude Code

[rjwalters]

Not sure what your philosophy is on tests but here are a few if you like having a lot.