feat(storage): switch to eviction time disk cache insertion

[MrCroxx]

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What's changed and what's your intention?

Motivation: Previously, foyer does a double-write on both in-memory cache and disk cache on insertion. The total cache volume is max(mem, disk), which is inefficient on large memory setups.

This PR replace the double-write on insertion with eviction-time disk cache insertion. The total cache volume is mem + disk.

Related foyer side PR: foyer-rs/foyer#830

Checklist

• I have written necessary rustdoc comments.
• I have added necessary unit tests and integration tests.
• I have added test labels as necessary.
• I have added fuzzing tests or opened an issue to track them.
• My PR contains breaking changes.
• My PR changes performance-critical code, so I will run (micro) benchmarks and present the results.
• My PR contains critical fixes that are necessary to be merged into the latest release.

Documentation

• My PR needs documentation updates.

Release note

[MrCroxx]

Benchmark with 10 Gib (small) disk cache vs baseline (without this PR).

(Seems something wrong with the baseline, but doesn't affect the conclusion.