core: update interfaces

[xenowits]

Update SignedData interface to include:

• Signatures() []Signature - Replaces Signature()
• SetSignatures([]Signature) (SignedData, error) - Replaces SetSignature()
• MessageRoots() ([][32]byte, error) - Replaces MessageRoot()
• HashRoot() ([32]byte, error)

Also, update Eth2SignedData interface to include:

• DomainNames() []signing.DomainName - Replaces DomainName()

These changes to the core interfaces are done in order to prepare for the upcoming deneb ethereum upgrade.

category: feature
ticket: #2597

[codecov]

Codecov Report

Attention: 160 lines in your changes are missing coverage. Please review.

Comparison is base (871bd33) 53.49% compared to head (bfb94e2) 53.33%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2635      +/-   ##
==========================================
- Coverage   53.49%   53.33%   -0.17%     
==========================================
  Files         202      202              
  Lines       27339    27501     +162     
==========================================
+ Hits        14625    14667      +42     
- Misses      10891    10986      +95     
- Partials     1823     1848      +25     

Files	Coverage Δ
cmd/createcluster.go	59.82% <100.00%> (ø)
core/fetcher/fetcher.go	64.96% <100.00%> (ø)
core/proto.go	64.24% <100.00%> (+0.95%)	⬆️
core/tracker/tracker.go	79.51% <100.00%> (ø)
core/types.go	27.07% <ø> (ø)
dkg/dkg.go	57.12% <100.00%> (ø)
core/parsigdb/memory.go	53.90% <75.00%> (ø)
core/eth2signeddata.go	72.36% <75.67%> (-8.59%)	⬇️
core/sigagg/sigagg.go	63.72% <67.56%> (+1.70%)	⬆️
core/signeddata.go	42.66% <37.55%> (-4.92%)	⬇️

... and 7 files with indirect coverage changes

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[gsora]

Generally LFTM, left some comments that need addressing before giving the green light.

[gsora]

LFTM