Multisig collaboration with sample scripts

[pfeairheller]

This PR includes:

• Credential registry creation works for multisig agents
• Scripts and client changes to get credential registry creation and credential creation working
• Credential created and granted from multisig AID with KERIA participant.
• Successful GRANT and ADMIT returning from holder to multisig issuer
• Fixing tests, cleaning up scripts, minor bug fixes

[codecov]

Codecov Report

Merging #81 (60a19e4) into development (e7f0356) will increase coverage by 0.11%.
The diff coverage is 88.46%.

@@               Coverage Diff               @@
##           development      #81      +/-   ##
===============================================
+ Coverage        88.12%   88.23%   +0.11%     
===============================================
  Files               14       14              
  Lines              884      952      +68     
===============================================
+ Hits               779      840      +61     
- Misses             105      112       +7     

Files	Coverage Δ
src/signify/app/notifying.py	100.00% <100.00%> (ø)
src/signify/core/authing.py	53.44% <ø> (+0.60%)	⬆️
src/signify/peer/exchanging.py	52.63% <100.00%> (ø)
src/signify/app/clienting.py	98.58% <33.33%> (-0.94%)	⬇️
src/signify/app/credentialing.py	93.22% <90.41%> (-4.82%)	⬇️

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