Multisig Group Key Event Interop

[pfeairheller]

This PR includes:

• New script and a few fixes to provide full interop with KERIpy for all group multisig key events across client types.

[codecov]

Codecov Report

Merging #80 (490a39e) into development (48bf1f6) will not change coverage.
The diff coverage is 83.33%.

@@             Coverage Diff              @@
##           development      #80   +/-   ##
============================================
  Coverage        88.12%   88.12%           
============================================
  Files               14       14           
  Lines              884      884           
============================================
  Hits               779      779           
  Misses             105      105           

Files Changed	Coverage Δ
src/signify/peer/exchanging.py	52.63% <0.00%> (ø)
src/signify/app/aiding.py	100.00% <100.00%> (ø)
src/signify/core/keeping.py	96.87% <100.00%> (ø)

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