refactor: remove in-memory cache listener, advancve disk cache insert

[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.

This PR is a prerequisite of replacing the foyer-storage engine.

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)

close #462

[codecov]

Codecov Report

Attention: Patch coverage is 79.59184% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 81.59%. Comparing base (baebadb) to head (7011a15).

Files	Patch %	Lines
foyer/src/hybrid.rs	64.70%	6 Missing ⚠️
foyer-memory/src/cache.rs	88.23%	2 Missing ⚠️
foyer-memory/src/generic.rs	90.90%	1 Missing ⚠️
foyer-storage/src/large/generic.rs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #463      +/-   ##
==========================================
- Coverage   81.71%   81.59%   -0.12%     
==========================================
  Files          75       74       -1     
  Lines        9450     9380      -70     
==========================================
- Hits         7722     7654      -68     
+ Misses       1728     1726       -2     

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