refactor: remove chunk header signature verification from epoch manager

[stedfn]

The MR moves the chunk header signature verification outside of the epoch manager

[codecov]

Codecov Report

Attention: Patch coverage is 85.45455% with 8 lines in your changes missing coverage. Please review.

Project coverage is 69.84%. Comparing base (7dfdfb0) to head (04b7807).

Files with missing lines	Patch %	Lines
chain/chain/src/signature_verification.rs	87.09%	1 Missing and 3 partials ⚠️
chain/chunks/src/shards_manager_actor.rs	80.00%	0 Missing and 3 partials ⚠️
chain/chain/src/validate.rs	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #12462       +/-   ##
===========================================
+ Coverage    1.60%   69.84%   +68.24%     
===========================================
  Files         667      839      +172     
  Lines      118468   169381    +50913     
  Branches   118468   169381    +50913     
===========================================
+ Hits         1897   118310   +116413     
+ Misses     116363    45821    -70542     
- Partials      208     5250     +5042     

Flag	Coverage Δ
backward-compatibility	0.16% <0.00%> (ø)
db-migration	0.16% <0.00%> (ø)
genesis-check	1.29% <0.00%> (+<0.01%)	⬆️
linux	69.16% <85.45%> (+67.55%)	⬆️
linux-nightly	69.43% <85.45%> (?)
macos	51.01% <78.18%> (?)
pytests	1.60% <0.00%> (+<0.01%)	⬆️
sanity-checks	1.40% <0.00%> (+<0.01%)	⬆️
unittests	69.67% <85.45%> (?)
upgradability	0.21% <0.00%> (ø)

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[shreyan-gupta]

I'm assuming we would be moving other verify functions to this file soon?

[stedfn]

I'm assuming we would be moving other verify functions to this file soon?

Yes, that's what I plan