feat(index): add file_size_hint for remote blob reader

[WenyXu]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

Add the file_size_hint parameter to remote_blob_reader to optimize performance by using the file size from the manifest instead of making an additional remote request. This reduces latency for the first query when reading remote index files without any cache.

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

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[codecov]

Codecov Report

Attention: Patch coverage is 63.49206% with 23 lines in your changes missing coverage. Please review.

Project coverage is 83.79%. Comparing base (1a8e77a) to head (83d5d63).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5147      +/-   ##
==========================================
- Coverage   84.05%   83.79%   -0.26%     
==========================================
  Files        1169     1169              
  Lines      217737   217796      +59     
==========================================
- Hits       183015   182503     -512     
- Misses      34722    35293     +571