chore: update default cache size to 1Gib

[killme2008]

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?

• Set read/write cache size to 1Gib by default for object storage. The current default value is too conservative.
• Add some tips in the configuration comments, suggesting enabling read/write cache when using object storage.

Checklist

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

[coderabbitai]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.92%. Comparing base (1ff29d8) to head (bdc0bf7).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4923      +/-   ##
==========================================
- Coverage   84.16%   83.92%   -0.25%     
==========================================
  Files        1137     1137              
  Lines      210022   210022              
==========================================
- Hits       176771   176260     -511     
- Misses      33251    33762     +511     

[zyy17]

lgtm