cachekit 0.7.0

High-performance cache primitives with pluggable eviction policies (LRU, LFU, FIFO, 2Q, Clock-PRO, S3-FIFO) and optional metrics.
Documentation
## Description

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## Related Issue

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Fixes #

## Type of Change

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- [ ] ๐Ÿ› Bug fix (non-breaking change that fixes an issue)
- [ ] โœจ New feature (non-breaking change that adds functionality)
- [ ] ๐Ÿ’ฅ Breaking change (fix or feature that would cause existing functionality to change)
- [ ] ๐Ÿ“ Documentation update
- [ ] ๐Ÿ”ง Refactoring (no functional changes)
- [ ] โšก Performance improvement
- [ ] ๐Ÿงช Test addition or modification

## How Has This Been Tested?

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- [ ] Unit tests
- [ ] Integration tests
- [ ] Manual testing

**Test environment:**
- OS:
- Rust version:

## Checklist

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- [ ] My code follows the project's coding standards
- [ ] I have run `cargo fmt` and `cargo clippy`
- [ ] I have added tests for my changes
- [ ] All new and existing tests pass (`cargo test`)
- [ ] I have updated the documentation as needed
- [ ] I have added an entry to CHANGELOG.md (if applicable)

## Screenshots (if applicable)

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## Additional Notes

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