feat(index-cache): abstract IndexCache to be shared by multi types of indexes

[zhongzc]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

#5176

What's changed and what's your intention?

that bloom_filter and inverted_index can easily reuse the struct.

PR Checklist

Please convert it to a draft if some of the following conditions are not met.

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.
• API changes are backward compatible.
• Schema or data changes are backward compatible.

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Copilot reviewed 6 out of 9 changed files in this pull request and generated 2 comments.

Files not reviewed (3)

• src/mito2/src/sst/index/inverted_index/applier/builder.rs: Evaluated as low risk
• src/index/src/inverted_index/format/reader/blob.rs: Evaluated as low risk
• src/mito2/src/sst/index/inverted_index/creator.rs: Evaluated as low risk

[fengjiachun]

Rest LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 94.18960% with 19 lines in your changes missing coverage. Please review.

Project coverage is 83.85%. Comparing base (2082c4b) to head (1eb73ec).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5219      +/-   ##
==========================================
- Coverage   84.08%   83.85%   -0.24%     
==========================================
  Files        1184     1185       +1     
  Lines      219872   219911      +39     
==========================================
- Hits       184889   184411     -478     
- Misses      34983    35500     +517