dkg: implement signing todos

[corverroos]

Implement signing and aggregation functions.

category: feature
ticket: #478

[codecov]

Codecov Report

Merging #519 (979b0a5) into main (8236459) will decrease coverage by 0.72%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #519      +/-   ##
==========================================
- Coverage   55.06%   54.34%   -0.73%     
==========================================
  Files          91       91              
  Lines        8425     8465      +40     
==========================================
- Hits         4639     4600      -39     
- Misses       3176     3253      +77     
- Partials      610      612       +2     

Impacted Files	Coverage Δ
dkg/dkg.go	41.37% <0.00%> (-7.49%)	⬇️
core/qbft/qbft.go	77.32% <0.00%> (-8.85%)	⬇️

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[dB2510]

LGTM