Separate db instance for cells

[pashinov]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 79.00000% with 21 lines in your changes missing coverage. Please review.

Project coverage is 47.51%. Comparing base (b811685) to head (c3de50f).
Report is 74 commits behind head on master.

Files with missing lines	Patch %	Lines
storage/src/store/shard_state/store_state_raw.rs	42.85%	6 Missing and 2 partials ⚠️
storage/src/db/kv_db/mod.rs	46.15%	7 Missing ⚠️
storage/src/store/shard_state/mod.rs	60.00%	4 Missing ⚠️
storage/src/lib.rs	90.90%	0 Missing and 1 partial ⚠️
storage/src/store/shard_state/cell_storage.rs	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #746      +/-   ##
==========================================
+ Coverage   47.38%   47.51%   +0.12%     
==========================================
  Files         296      296              
  Lines       57500    57435      -65     
  Branches    57500    57435      -65     
==========================================
+ Hits        27249    27290      +41     
+ Misses      28847    28751      -96     
+ Partials     1404     1394      -10     

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