Add abstraction of LocalTableData to LocalStorage

[ray6080]

This is an abstraction that will be used for rel tables, as each rel table will require both fwd and bwd data. The idea is same as what we did with Table and TableData.

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (80a8b59) 91.21% compared to head (b7e820f) 91.16%.
Report is 2 commits behind head on master.

❗ Current head b7e820f differs from pull request most recent head 3cde464. Consider uploading reports for the commit 3cde464 to get more accurate results

Files	Patch %	Lines
src/storage/store/rel_table.cpp	0.00%	2 Missing ⚠️
src/storage/local_storage/local_table.cpp	94.44%	1 Missing ⚠️
src/storage/store/rel_table_data.cpp	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2420      +/-   ##
==========================================
- Coverage   91.21%   91.16%   -0.05%     
==========================================
  Files        1020     1020              
  Lines       36344    36327      -17     
==========================================
- Hits        33152    33119      -33     
- Misses       3192     3208      +16     

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