feat(storage): split cells cache

[Rexagon]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 54.01460% with 126 lines in your changes missing coverage. Please review.

Project coverage is 43.10%. Comparing base (4755326) to head (407f949).

Files with missing lines	Patch %	Lines
storage/src/store/shard_state/cell_storage.rs	51.78%	105 Missing and 3 partials ⚠️
storage/src/store/shard_state/mod.rs	47.36%	5 Missing and 5 partials ⚠️
storage/src/store/shard_state/store_state_raw.rs	0.00%	6 Missing ⚠️
storage/src/lib.rs	0.00%	0 Missing and 1 partial ⚠️
...e/src/store/persistent_state/shard_state/writer.rs	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #470      +/-   ##
==========================================
+ Coverage   43.00%   43.10%   +0.10%     
==========================================
  Files         266      265       -1     
  Lines       46484    46454      -30     
  Branches    46484    46454      -30     
==========================================
+ Hits        19989    20026      +37     
+ Misses      25413    25341      -72     
- Partials     1082     1087       +5     

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