core: add sync committee duties to proto

[dB2510]

Adds support for sync committee duties data to proto.

category: refactor
ticket: #1263

[codecov]

Codecov Report

Base: 53.88% // Head: 54.07% // Increases project coverage by +0.19% 🎉

Coverage data is based on head (c75a2e8) compared to base (8bf8ab0).
Patch coverage: 50.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1375      +/-   ##
==========================================
+ Coverage   53.88%   54.07%   +0.19%     
==========================================
  Files         144      144              
  Lines       17661    17679      +18     
==========================================
+ Hits         9516     9560      +44     
+ Misses       6835     6804      -31     
- Partials     1310     1315       +5     

Impacted Files	Coverage Δ
core/eth2signeddata.go	80.95% <ø> (ø)
core/signeddata.go	44.12% <ø> (+0.30%)	⬆️
core/proto.go	61.90% <50.00%> (-1.06%)	⬇️
core/unsigneddata.go	47.96% <50.00%> (+0.98%)	⬆️
app/vmock.go	75.40% <0.00%> (-3.75%)	⬇️
core/scheduler/scheduler.go	73.38% <0.00%> (-1.20%)	⬇️
app/app.go	60.21% <0.00%> (-0.87%)	⬇️
core/dutydb/memory.go	69.28% <0.00%> (+0.69%)	⬆️
... and 1 more

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