dkg/sync: support relay reconnect

[corverroos]

Adds support to DKG sync protocol to seamlessly reconnect on relay circuit.

Also adds support for external bootnode to compose. This was used to test the implementation.

category: feature
ticket: #684

[codecov]

Codecov Report

Merging #763 (b00cb16) into main (616f4da) will increase coverage by 0.43%.
The diff coverage is 41.17%.

@@            Coverage Diff             @@
##             main     #763      +/-   ##
==========================================
+ Coverage   54.35%   54.79%   +0.43%     
==========================================
  Files         107      107              
  Lines       10485    10496      +11     
==========================================
+ Hits         5699     5751      +52     
+ Misses       3937     3896      -41     
  Partials      849      849              

Impacted Files	Coverage Δ
dkg/sync/server.go	68.91% <0.00%> (-0.95%)	⬇️
testutil/compose/compose/main.go	0.00% <0.00%> (ø)
testutil/compose/config.go	83.33% <ø> (ø)
testutil/compose/lock.go	70.87% <50.00%> (-2.05%)	⬇️
dkg/sync/client.go	72.00% <75.00%> (ø)
p2p/p2p.go	24.27% <0.00%> (+0.97%)	⬆️
core/qbft/qbft.go	81.97% <0.00%> (+10.30%)	⬆️

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[dB2510]

LGTM