Add Serialize trait to core data structures

[ishiko732]

This PR adds Serialize trait support to the core FSRS data structures, enabling serialization capabilities for key types
used throughout the library.

ref :

• Initialize a Rust project inside a monorepo ts-fsrs#223 (comment)
• open-spaced-repetition/ts-fsrs@de2303d

[gemini-code-assist]

Summary of Changes

Hello @ishiko732, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces serialization capabilities to the fundamental data structures within the FSRS library. By deriving the Serialize trait for key types, it paves the way for easier data persistence, exchange, and integration with other systems that rely on structured data formats.

Highlights

• Serialization Support: The Serialize trait from the serde crate has been added to several core data structures, enabling them to be easily converted into various data formats.
• Core Data Structures Updated: The MemoryState, NextStates, and ItemState structs in src/inference.rs now implement the Serialize trait.

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[gemini-code-assist]

Code Review

This pull request adds Serialize trait support to several core data structures (MemoryState, NextStates, ItemState), which is a valuable enhancement for the library. The changes are correct and well-implemented. I've suggested extending this serialization support to a few other public data structures in the same file for consistency. Overall, this is a good improvement.

[gemini-code-assist]

This is a good addition. For consistency and to further enhance the library's serialization capabilities, consider also adding #[derive(Serialize)] to other public data structures in this file. Specifically, ModelEvaluation, ItemProgress, and TimeSeriesSplit seem like good candidates as they are also part of the public API and would benefit from being serializable.

[L-M-Sherlock]

LGTM