Add database migration

[chenyukang]

• Add db migration for change schemas
• Some code refactor on store

Closes #117

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 64.58333% with 68 lines in your changes missing coverage. Please review.

Project coverage is 44.76%. Comparing base (27d6b47) to head (18bd9a8).

Files with missing lines	Patch %	Lines
src/store.rs	43.24%	42 Missing ⚠️
src/migration/migration.rs	73.86%	23 Missing ⚠️
src/migration/db_migrate.rs	86.66%	2 Missing ⚠️
src/fiber/serde_utils.rs	93.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #315      +/-   ##
==========================================
+ Coverage   44.65%   44.76%   +0.10%     
==========================================
  Files          44       46       +2     
  Lines       28075    28233     +158     
==========================================
+ Hits        12538    12638     +100     
- Misses      15537    15595      +58     

Flag	Coverage Δ
unittests	44.76% <64.58%> (+0.10%)	⬆️

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