Rework local storage for node table and fix #2376

[ray6080]

• Rework local storage to be more space efficient. Instead of always allocating a Vector of 2048 whenever an update/insert resides in its offset range. For example, update at offset 0 and offset 2049 will allocate two Vectors. In this PR, updates/inserts always append to the end of a collection of Vectors, which allocates as needed and one value at a time. The mapping between node offsets and row idx is maintained in extra maps.
• Fix issue 2376. The issue is due to incorrectly updating hash index when updates on node table involves the primary key column.

Note that this PR also forces flattening on updates/deletions/insertions, which is to simplify the implementation of following fixes on rel updates/deletions/insertions. This can bring performance down, though it's not profiled by how much, and should be solved at once as we optimize the update performance after all fixes.
Also, there are quite few places not covered by tests, which are mostly due to that lots of tests on rel updates are disabled. I will revisit the test coverage after my fixes on rel updates.

TODOs

• Revisit and improve storage test coverage.
• Remove the rigid flatten all rules on updates/insertions/deletions.

[codecov]

Codecov Report

Attention: 32 lines in your changes are missing coverage. Please review.

Comparison is base (684511c) 91.24% compared to head (5b73d7b) 91.21%.

Files	Patch %	Lines
src/storage/store/column_chunk.cpp	30.76%	18 Missing ⚠️
src/storage/store/string_column_chunk.cpp	0.00%	5 Missing ⚠️
src/storage/store/column.cpp	94.73%	3 Missing ⚠️
src/storage/store/rel_table.cpp	40.00%	3 Missing ⚠️
src/storage/local_table.cpp	98.24%	2 Missing ⚠️
src/storage/store/rel_table_data.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2394      +/-   ##
==========================================
- Coverage   91.24%   91.21%   -0.03%     
==========================================
  Files        1022     1020       -2     
  Lines       36323    36336      +13     
==========================================
+ Hits        33144    33145       +1     
- Misses       3179     3191      +12     

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