[epoch] Move EpochInfoAggregator to core/primitives

[shreyan-gupta]

This is required for a new epoch store adapter.

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 70.41%. Comparing base (fb3c0cc) to head (cbec01e).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
chain/epoch-manager/src/lib.rs	81.81%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #12855      +/-   ##
==========================================
- Coverage   70.42%   70.41%   -0.01%     
==========================================
  Files         853      853              
  Lines      174114   174093      -21     
  Branches   174114   174093      -21     
==========================================
- Hits       122614   122585      -29     
- Misses      46284    46290       +6     
- Partials     5216     5218       +2     

Flag	Coverage Δ
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db-migration	0.35% <0.00%> (+<0.01%)	⬆️
genesis-check	1.41% <0.00%> (+<0.01%)	⬆️
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unittests	70.23% <90.00%> (-0.01%)	⬇️
upgradability	0.35% <0.00%> (+<0.01%)	⬆️

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[pugachAG]

LGTM, but as far as I understand primitives mostly contains data structs, so doesn't seem like EpochInfoAggregator belongs there, maybe move it somewhere to store/utils?

[shreyan-gupta]

LGTM, but as far as I understand primitives mostly contains data structs, so doesn't seem like EpochInfoAggregator belongs there, maybe move it somewhere to store/utils?

Yes, you're right. This shouldn't be part of primitives. I'm not sure whether I should move it to store/util/ or store/epoch/ or just store/epoch_info_aggregator.rs

[pugachAG]

@shreyan-gupta probably just store/epoch_info_aggregator.rs is good enough for now, later we can consider moving some of the files from store/ into subdirectories as part of a separate effort