minor improvement on GC and add StaticLifetime trait

[jiangzhe]

No description provided.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 91.35802% with 7 lines in your changes missing coverage. Please review.

Project coverage is 70.38%. Comparing base (9948cfe) to head (b73cbea).

Files with missing lines	Patch %	Lines
doradb-storage/src/trx/log.rs	50.00%	4 Missing ⚠️
doradb-storage/src/trx/purge.rs	96.61%	2 Missing ⚠️
doradb-storage/src/trx/sys.rs	87.50%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #159      +/-   ##
==========================================
+ Coverage   70.35%   70.38%   +0.02%     
==========================================
  Files         147      148       +1     
  Lines       20650    20663      +13     
==========================================
+ Hits        14529    14544      +15     
+ Misses       6121     6119       -2     

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