feat: implement MultiSignatureService

[faustbrian]

Resolves #479

[codecov]

Codecov Report

Merging #480 into master will decrease coverage by 0.14%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #480      +/-   ##
==========================================
- Coverage   72.85%   72.71%   -0.15%     
==========================================
  Files          52       52              
  Lines        1028     1030       +2     
  Branches       73       73              
==========================================
  Hits          749      749              
- Misses        250      252       +2     
  Partials       29       29              

Flag	Coverage Δ
#unit	72.71% <0.00%> (-0.15%)	⬇️

Impacted Files	Coverage Δ
packages/platform-sdk/src/coins/coin-factory.ts	0.00% <ø> (ø)
packages/platform-sdk/src/coins/coin.ts	0.00% <0.00%> (ø)
packages/platform-sdk/src/contracts/coins/index.ts	0.00% <0.00%> (ø)

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