core/validatorapi: add support for DutySyncContribution

[xenowits]

Adds support for DutySyncContribution to validatorapi.

category: feature
ticket: #1267

[codecov]

Codecov Report

Base: 54.20% // Head: 53.67% // Decreases project coverage by -0.53% ⚠️

Coverage data is based on head (6afd22b) compared to base (d2c0053).
Patch coverage: 45.71% of modified lines in pull request are covered.

❗ Current head 6afd22b differs from pull request most recent head 4fe10c6. Consider uploading reports for the commit 4fe10c6 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1363      +/-   ##
==========================================
- Coverage   54.20%   53.67%   -0.54%     
==========================================
  Files         144      142       -2     
  Lines       17516    17719     +203     
==========================================
+ Hits         9495     9511      +16     
- Misses       6722     6874     +152     
- Partials     1299     1334      +35     

Impacted Files	Coverage Δ
core/signeddata.go	38.27% <0.00%> (-8.47%)	⬇️
core/validatorapi/eth2types.go	50.00% <ø> (ø)
core/validatorapi/router.go	62.13% <47.72%> (-0.46%)	⬇️
eth2util/signing/signing.go	41.53% <52.00%> (+7.15%)	⬆️
core/validatorapi/validatorapi.go	57.05% <54.54%> (-1.29%)	⬇️
core/parsigex/parsigex.go	58.99% <0.00%> (-3.65%)	⬇️
testutil/beaconmock/attestation.go	82.60% <0.00%> (-3.11%)	⬇️
core/priority/prioritiser.go	61.65% <0.00%> (-2.08%)	⬇️
core/qbft/qbft.go	80.47% <0.00%> (-1.51%)	⬇️
... and 11 more

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