refactor buffer pool

[jiangzhe]

Refactor buffer pool API with static lifetime.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 71.83099% with 40 lines in your changes missing coverage. Please review.

Project coverage is 70.07%. Comparing base (51a32fc) to head (1ae1c29).

Files with missing lines	Patch %	Lines
doradb-storage/src/buffer/fixed.rs	72.11%	29 Missing ⚠️
doradb-storage/src/catalog/storage.rs	0.00%	5 Missing ⚠️
doradb-storage/src/table/mod.rs	61.53%	5 Missing ⚠️
doradb-storage/src/row/mod.rs	66.66%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #164      +/-   ##
==========================================
- Coverage   70.07%   70.07%   -0.01%     
==========================================
  Files         153      153              
  Lines       20787    20786       -1     
==========================================
- Hits        14567    14566       -1     
  Misses       6220     6220              

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