Basic garbage collect

[jiangzhe]

#157

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 63.43085% with 275 lines in your changes missing coverage. Please review.

Project coverage is 70.33%. Comparing base (7fbdb94) to head (cb9620b).

Files with missing lines	Patch %	Lines
doradb-storage/src/trx/log.rs	60.60%	91 Missing ⚠️
doradb-storage/src/trx/row.rs	5.17%	55 Missing ⚠️
doradb-storage/examples/bench_insert.rs	0.00%	32 Missing ⚠️
doradb-storage/src/trx/purge.rs	86.90%	22 Missing ⚠️
doradb-storage/src/catalog.rs	75.00%	20 Missing ⚠️
doradb-storage/src/trx/group.rs	40.00%	12 Missing ⚠️
doradb-storage/src/trx/sys.rs	85.54%	12 Missing ⚠️
doradb-storage/src/index/secondary_index.rs	41.17%	10 Missing ⚠️
doradb-storage/src/table/mod.rs	70.00%	9 Missing ⚠️
doradb-storage/src/trx/mod.rs	73.33%	4 Missing ⚠️
... and 3 more

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #158      +/-   ##
==========================================
- Coverage   70.36%   70.33%   -0.03%     
==========================================
  Files         144      147       +3     
  Lines       20281    20650     +369     
==========================================
+ Hits        14270    14525     +255     
- Misses       6011     6125     +114     

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