feat: Implement the Buf to avoid extra memory allocation

[ozewr]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

close #4065

What's changed and what's your intention?

Impl new function into_buffer for Entry in /home/wr/workspace/greptimedb/src/store-api/src/logstore/entry.rs.
This function returns a buffer that comes from the opendal library, but is reused in the object-store.
Use into_buffer to avoid extra memory allocation in file src/mito2/src/wal/entry_reader.rs.

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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[waynexia]

Looks good to me, thanks @ozewr !

[waynexia]

Looks good to me, thanks @ozewr !

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.63%. Comparing base (8de11a0) to head (06383ad).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4585      +/-   ##
==========================================
- Coverage   84.90%   84.63%   -0.27%     
==========================================
  Files        1096     1096              
  Lines      196649   196655       +6     
==========================================
- Hits       166963   166448     -515     
- Misses      29686    30207     +521     

[WenyXu]

Rest LGTM