feat(stake): enhance documentation and code quality in stake CPI module

[techvoyagerX]

Summary

This pull request improves the spl/src/stake.rs file by enhancing its documentation, refining error handling, and ensuring adherence to idiomatic Rust practices.

Changes

1. Enhanced Documentation: Added detailed comments for all public functions and structs to improve clarity and usability.
2. Improved Error Context: Error messages now include contextual information for easier debugging.
3. Idiomatic Rust Improvements: Refactored code to align with Rust's best practices and improved consistency.
4. Account Verification: Ensured account ownership and type validations where applicable.

Benefits

• Makes the code more maintainable and readable.
• Simplifies onboarding for new contributors.
• Provides clearer error messages, improving debugging experience.

Checklist

• Added detailed comments for all public functions and structs.
• Improved error handling with additional context.
• Refactored code to ensure alignment with idiomatic Rust practices.
• Verified functionality through existing or updated tests.

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Name	Status	Preview	Comments	Updated (UTC)
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