Version 0.2.0

Added

• Implemented weighted_wer functionality to calculate Weighted Word Error Rate with customizable weights for insertion, deletion, and substitution errors.
• Introduced Python API alias wwer for convenience alongside weighted_wer.
• Created utils.rs module containing the shared extract_string_list utility function, marked as pub and #[inline] for performance.
• Added detailed Rust doc comments and Python docstrings, including usage examples and parameter descriptions.
• Introduced test_weighted_wer.py with comprehensive unit tests for the weighted_wer function.
• Verified correct handling of default and custom weight configurations.
• Added tests for edge cases including zero weights, empty inputs, mismatched lengths, and invalid input types.
• Benchmark script to compare execution speed between werx.wer (standard WER) and werx.weighted_wer (weighted WER).
• weighted_wer_results.py script to visualize weighted WER results and validate benchmark outputs.

Changed

• Extracted the extract_string_list utility function from wer.rs and moved it to a new utils.rs module for shared usage.
• Marked extract_string_list as pub and #[inline] for performance and cross-module access.
• Updated wer.rs to import extract_string_list from utils.rs.
• Updated Python __init__.py to expose the new weighted_wer and wwer functions.