Mdp-py

Added
- Support for collection ID types including URI, UUID, CID, and string
- Enhanced relationship support with better validation
- Added document versioning features
- Improved conflict resolution system

Changed
- Refactored Document class for better user experience
- MDPFile.write_mdp now returns an MDPFile object instead of a Path

Fixed
- Various bug fixes and improvements to IPFS integration
- Fixed relationship metadata handling

Added
- Initial release with core functionality
- Basic document structure and metadata
- Simple relationship model
- CLI interface

Added
- IPFS integration for document relationships
- Support for IPFS CIDs in metadata
- IPFS URI validation and parsing
- 'relationships' property to Document class for easier access
- Support for 'id' parameter in relationship functions as an alternative to 'reference'/'target'

Fixed
- Validation for IPFS URIs in relationship fields
- Improved error handling for relationship creation