feat(repository): add language statistics analysis feature
- Remove data directory from gitignore to include language data - Add build script to parse linguist languages.yml and generate static mappings - Include serde and serde_yml dependencies for YAML parsing - Add lang_stats module with language detection and statistics calculation - Generate protobuf definitions for language statistics API endpoints - Implement GetLanguageStats RPC endpoint in repository server - Add comprehensive test suite for language statistics functionality - Include extension and filename based language detection logic - Implement binary file classification and group resolution features
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