docs: add spec for latest EIP712 signatures

[dB2510]

Adds spec for latest EIP712 signature changes. Also refactors the code structure a bit.

category: docs
ticket: #1203

[codecov]

Codecov Report

Base: 53.39% // Head: 53.38% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (df9ddbc) compared to base (54d0553).
Patch coverage: 77.04% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1234      +/-   ##
==========================================
- Coverage   53.39%   53.38%   -0.01%     
==========================================
  Files         138      139       +1     
  Lines       16132    16127       -5     
==========================================
- Hits         8614     8610       -4     
- Misses       6268     6269       +1     
+ Partials     1250     1248       -2     

Impacted Files	Coverage Δ
cluster/eip712sigs.go	75.00% <75.00%> (ø)
cluster/test_cluster.go	82.45% <75.00%> (+3.94%)	⬆️
cluster/definition.go	60.07% <100.00%> (+0.96%)	⬆️
cluster/helpers.go	59.43% <100.00%> (-4.46%)	⬇️
dkg/transport.go	53.70% <0.00%> (-12.97%)	⬇️
core/priority/prioritiser.go	60.52% <0.00%> (-1.32%)	⬇️
core/scheduler/scheduler.go	73.13% <0.00%> (-0.54%)	⬇️
app/vmock.go	73.85% <0.00%> (+1.96%)	⬆️

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