improve mvcc with index, undo, rollback, catalog, etc

[jiangzhe]

Improve MVCC with following:

1. Add simple catalog to retrieve table instance for statement-level rollback.
2. Implement unique index with single-key and multi-key partitioned btree map.
3. Simple SmartKey for index key(not used).
4. Statement-level rollback.
5. lightweight row undo log structure refactor.
6. Index undo for rollback and GC.
7. Reborn branch in row undo chain.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 38.02661% with 559 lines in your changes missing coverage. Please review.

Project coverage is 70.36%. Comparing base (1220556) to head (e420292).

Files with missing lines	Patch %	Lines
doradb-storage/src/table/mod.rs	39.22%	189 Missing ⚠️
doradb-storage/src/value.rs	13.84%	112 Missing ⚠️
doradb-storage/src/index/secondary_index.rs	25.78%	95 Missing ⚠️
doradb-storage/src/index/smart_key.rs	0.00%	55 Missing ⚠️
doradb-storage/src/trx/row.rs	29.31%	41 Missing ⚠️
doradb-storage/src/table/schema.rs	67.21%	20 Missing ⚠️
doradb-datatype/src/konst.rs	0.00%	16 Missing ⚠️
doradb-storage/src/trx/undo/row.rs	65.85%	14 Missing ⚠️
doradb-storage/src/row/mod.rs	70.00%	9 Missing ⚠️
doradb-storage/src/trx/undo/index.rs	88.57%	4 Missing ⚠️
... and 3 more

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #155      +/-   ##
==========================================
- Coverage   71.58%   70.36%   -1.23%     
==========================================
  Files         142      144       +2     
  Lines       19707    20281     +574     
==========================================
+ Hits        14108    14271     +163     
- Misses       5599     6010     +411     

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