feat(resharding) - Stabilize Resharding V3

[wacban]

Feature to stabilize

This PR stabilizes Resharding V3. It introduces a new implementation for resharding and two new shard layouts for the production networks.

Context

• NEP: NEP-568: Resharding V3 NEPs#568
• Implementation: 🔷 [Project Tracking] Resharding v3 #11881

Testing and QA

This feature was extensively tested in unit tests, testloop tests and in forknet.

Checklist

• Link to nightly nayduck run https://nayduck.nearone.org/#/run/1142
• Update CHANGELOG.md to include this protocol feature in the Unreleased section.

[shreyan-gupta]

Thanks!

[Trisfald]

Many more changes than I expected, but it looks good!

[codecov]

Codecov Report

Attention: Patch coverage is 92.52336% with 8 lines in your changes missing coverage. Please review.

Project coverage is 70.51%. Comparing base (5b32984) to head (a109857).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
core/primitives/src/epoch_manager.rs	56.25%	7 Missing ⚠️
chain/epoch-manager/src/lib.rs	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #12792      +/-   ##
==========================================
- Coverage   70.53%   70.51%   -0.02%     
==========================================
  Files         846      846              
  Lines      174904   175018     +114     
  Branches   174904   175018     +114     
==========================================
+ Hits       123372   123418      +46     
- Misses      46282    46347      +65     
- Partials     5250     5253       +3     

Flag	Coverage Δ
backward-compatibility	0.16% <0.00%> (+<0.01%)	⬆️
db-migration	0.16% <0.00%> (+<0.01%)	⬆️
genesis-check	1.40% <5.88%> (+0.05%)	⬆️
linux	70.10% <92.52%> (+0.93%)	⬆️
linux-nightly	70.12% <92.52%> (-0.02%)	⬇️
pytests	1.70% <5.88%> (+0.05%)	⬆️
sanity-checks	1.51% <5.88%> (+0.05%)	⬆️
unittests	70.35% <92.52%> (-0.02%)	⬇️
upgradability	0.20% <0.00%> (ø)

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[wacban]

Many more changes than I expected, but it looks good!

Yeah those PRs are quite annoying. The tests broken due to double resharding were an extra hurdle but luckily not too bad.