basic transaction management system

[jiangzhe]

Define TransactionSystem with TrxID, STS, CTS generation.
Define interface of begin, commit and rollback.
Implement group commit.
Implement identification of old transaction base on minimum active STS for GC.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 51.89873% with 418 lines in your changes missing coverage. Please review.

Project coverage is 72.78%. Comparing base (3d02dc4) to head (0c77a0a).

Files with missing lines	Patch %	Lines
doradb-storage/src/value.rs	39.73%	138 Missing ⚠️
doradb-storage/src/row/mod.rs	43.45%	95 Missing ⚠️
doradb-storage/src/trx/sys.rs	71.06%	79 Missing ⚠️
doradb-storage/src/trx/mod.rs	33.33%	40 Missing ⚠️
doradb-storage/src/buffer/guard.rs	40.54%	22 Missing ⚠️
doradb-storage/src/row/ops.rs	10.00%	18 Missing ⚠️
doradb-storage/src/index/block_index.rs	52.94%	16 Missing ⚠️
doradb-storage/src/latch.rs	14.28%	6 Missing ⚠️
doradb-storage/src/buffer/mod.rs	91.89%	3 Missing ⚠️
doradb-storage/src/trx/redo.rs	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #145      +/-   ##
==========================================
- Coverage   73.63%   72.78%   -0.86%     
==========================================
  Files         123      128       +5     
  Lines       17382    17984     +602     
==========================================
+ Hits        12799    13089     +290     
- Misses       4583     4895     +312     

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