refactor: wrapper no/immutable/mutable op into Op

[MrCroxx]

What's changed and what's your intention?

Please explain IN DETAIL what the changes are in this PR and why they are needed. :D

As title.

Checklist

• I have written the necessary rustdoc comments
• I have added the necessary unit tests and integration tests
• I have passed make all (or make fast instead if the old tests are not modified) in my local environment.

Related issues or PRs (optional)

[codecov]

Codecov Report

Attention: Patch coverage is 87.20000% with 16 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
foyer-memory/src/eviction/test_utils.rs	60.00%	8 Missing ⚠️
foyer-memory/src/eviction/lfu.rs	83.78%	6 Missing ⚠️
foyer-memory/src/eviction/lru.rs	97.22%	1 Missing ⚠️
foyer-memory/src/raw.rs	75.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
foyer-memory/src/eviction/fifo.rs	90.80% <100.00%> (+7.64%)	⬆️
foyer-memory/src/eviction/mod.rs	100.00% <100.00%> (ø)
foyer-memory/src/eviction/s3fifo.rs	88.77% <100.00%> (+1.78%)	⬆️
foyer-memory/src/eviction/lru.rs	91.64% <97.22%> (+1.02%)	⬆️
foyer-memory/src/raw.rs	91.04% <75.00%> (+0.28%)	⬆️
foyer-memory/src/eviction/lfu.rs	85.40% <83.78%> (+1.36%)	⬆️
foyer-memory/src/eviction/test_utils.rs	74.19% <60.00%> (-25.81%)	⬇️

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