feat(storage): split cells cache

[Rexagon]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 79.38144% with 20 lines in your changes missing coverage. Please review.

Project coverage is 43.00%. Comparing base (84556e8) to head (7515760).
Report is 91 commits behind head on master.

Files with missing lines	Patch %	Lines
collator/src/collator/do_collate.rs	0.00%	6 Missing ⚠️
storage/src/store/shard_state/cell_storage.rs	90.62%	6 Missing ⚠️
core/src/block_strider/state_applier.rs	72.72%	0 Missing and 3 partials ⚠️
storage/src/store/shard_state/mod.rs	84.61%	0 Missing and 2 partials ⚠️
storage/src/store/shard_state/store_state_raw.rs	0.00%	2 Missing ⚠️
collator/src/state_node.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #466      +/-   ##
==========================================
- Coverage   43.03%   43.00%   -0.03%     
==========================================
  Files         262      262              
  Lines       45556    45601      +45     
  Branches    45556    45601      +45     
==========================================
+ Hits        19603    19611       +8     
- Misses      24898    24937      +39     
+ Partials     1055     1053       -2     

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