Allowing prefixes in identifiers endpoint (resubmitted PR)

[rodolfomiranda]

This PR is resubmitted version of the canceled #264
It's is an implementation of #217 and #202, fixing the problem of aliases with special characters .
The changes allow endpoints of the form /identifiers/{name} to accept an alias or a prefix in the name path. If the value is valid for both prefix and alias, the prefix is prioritized.
Basically, the PR replace:
hab = agent.hby.habByName(name)
with
hab = agent.hby.habs[name] if name in agent.hby.habs else agent.hby.habByName(name)

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 93.17%. Comparing base (18d3ad7) to head (57f9f0f).
Report is 13 commits behind head on main.

Files	Patch %	Lines
src/keria/app/aiding.py	88.88%	2 Missing ⚠️
src/keria/app/credentialing.py	90.00%	1 Missing ⚠️
src/keria/app/delegating.py	50.00%	1 Missing ⚠️
src/keria/app/grouping.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #269      +/-   ##
==========================================
+ Coverage   93.06%   93.17%   +0.11%     
==========================================
  Files          36       36              
  Lines        7121     7741     +620     
==========================================
+ Hits         6627     7213     +586     
- Misses        494      528      +34     

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