core/dutydb: add support for duty builder proposer

[ciaranmcveigh5]

• dutydb memory implementation for builder proposer
• relevant tests

category: feature
ticket: #809

[codecov]

Codecov Report

Merging #829 (1dc5a5a) into main (76ed685) will increase coverage by 0.80%.
The diff coverage is 69.01%.

@@            Coverage Diff             @@
##             main     #829      +/-   ##
==========================================
+ Coverage   53.92%   54.72%   +0.80%     
==========================================
  Files         109      111       +2     
  Lines       11183    11414     +231     
==========================================
+ Hits         6030     6246     +216     
- Misses       4253     4263      +10     
- Partials      900      905       +5     

Impacted Files	Coverage Δ
core/dutydb/memory.go	71.91% <69.01%> (-1.90%)	⬇️
dkg/transport.go	53.70% <0.00%> (-12.97%)	⬇️
core/deadline.go	68.00% <0.00%> (ø)
core/tracker/tracker.go	76.10% <0.00%> (ø)
core/tracker/component_string.go	40.00% <0.00%> (ø)
app/app.go	56.81% <0.00%> (+1.76%)	⬆️
core/qbft/qbft.go	81.97% <0.00%> (+10.30%)	⬆️

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