Support for endpoint role authorizations for group multisig AIDs

[pfeairheller]

This PR includes support for adding endpoint role auth records to group multisig AIDs by providing a framework for negotiating amongst members to all sign the same rpy messages. This same approach will be taken with credential APIs.

[codecov]

Codecov Report

Merging #88 (d45ea40) into main (7b55c3c) will increase coverage by 1.18%.
The diff coverage is 91.66%.

@@            Coverage Diff             @@
##             main      #88      +/-   ##
==========================================
+ Coverage   87.02%   88.20%   +1.18%     
==========================================
  Files          29       30       +1     
  Lines        4515     4789     +274     
==========================================
+ Hits         3929     4224     +295     
+ Misses        586      565      -21     

Files Changed	Coverage Δ
setup.py	0.00% <ø> (ø)
src/keria/db/basing.py	94.17% <ø> (ø)
src/keria/end/ending.py	31.37% <ø> (+2.28%)	⬆️
tests/app/test_specing.py	100.00% <ø> (ø)
src/keria/core/longrunning.py	62.73% <80.00%> (+1.42%)	⬆️
src/keria/app/aiding.py	77.74% <80.17%> (+6.73%)	⬆️
src/keria/app/agenting.py	81.32% <100.00%> (+0.03%)	⬆️
src/keria/core/httping.py	100.00% <100.00%> (ø)
src/keria/testing/testing_helper.py	99.29% <100.00%> (+<0.01%)	⬆️
tests/app/test_agenting.py	96.58% <100.00%> (+0.01%)	⬆️
... and 2 more

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