[wip] shard info provider trait

[stedfn]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 75.57252% with 96 lines in your changes missing coverage. Please review.

Project coverage is 70.45%. Comparing base (867e790) to head (37174fa).

Files with missing lines	Patch %	Lines
chain/chain/src/test_utils/kv_runtime.rs	73.11%	33 Missing and 17 partials ⚠️
chain/epoch-manager/src/shard_info_provider.rs	78.92%	22 Missing and 21 partials ⚠️
tools/flat-storage/src/commands.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #12827       +/-   ##
===========================================
+ Coverage    0.16%   70.45%   +70.29%     
===========================================
  Files         669      849      +180     
  Lines      120940   174852    +53912     
  Branches   120940   174852    +53912     
===========================================
+ Hits          199   123200   +123001     
+ Misses     120736    46401    -74335     
- Partials        5     5251     +5246     

Flag	Coverage Δ
backward-compatibility	0.16% <0.00%> (?)
db-migration	0.16% <0.00%> (ø)
genesis-check	1.41% <0.00%> (?)
linux	70.05% <75.57%> (+69.88%)	⬆️
linux-nightly	70.09% <75.57%> (?)
pytests	1.71% <0.00%> (+1.54%)	⬆️
sanity-checks	1.52% <0.00%> (?)
unittests	70.29% <75.57%> (?)
upgradability	0.20% <0.00%> (?)

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