feat: Add comprehensive Ruby support

[gabriel-dehan]

Adds comprehensive Ruby support.

Summary

• Ruby language support: Full tree-sitter-ruby integration for parsing Ruby code
• Ruby-specific constructs: Recognition of modules, classes, methods, singleton methods, and singleton classes
• Testing: added test cases covering Ruby-specific scenarios
• Documentation: Updated README with Ruby examples and usage patterns
• Backward compatibility: Tested all the other languages to make sure there were zero regressions

Changes Made

Core Implementation

• Added tree-sitter-ruby>=0.20.0 dependency to pyproject.toml and requirements.txt
• Extended ASTChunkBuilder to support Ruby language parsing
• Updated ASTChunk to recognize Ruby-specific AST node types:
  • class (Ruby class definitions)
  • module (Ruby module definitions)
  • method (Ruby instance methods)
  • singleton_method (Ruby singleton methods)
  • singleton_class (Ruby singleton classes)

Documentation

• Updated README.md to include Ruby in supported languages table
• Added Ruby usage examples and configuration options
• Enhanced documentation with Ruby-specific information

Usage Example

from astchunk import ASTChunkBuilder

# Ruby configuration
config = {
    "max_chunk_size": 800,
    "language": "ruby",  # New language support!
    "metadata_template": "default"
}

chunk_builder = ASTChunkBuilder(**config)
chunks = chunk_builder.chunkify(ruby_code)