feat: add initial implementation of rsli crate

- Created Cargo.toml for the rsli crate with flate2 dependency.
- Implemented ResourceData enum for handling borrowed and owned byte slices.
- Added OutputBuffer trait and its Vec<u8> implementation for writing data.
- Defined a comprehensive Error enum for error handling in the library.
- Developed the Library struct to manage resource entries and provide methods for loading and unpacking resources.
- Implemented various packing methods and decompression algorithms, including LZSS and Deflate.
- Added tests for validating the functionality of the rsli library against sample data.

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