feat: basic protection boot endpoint

[lenkan]

This PR implements a basic protection of the boot endpoint, this enables you to more easily deploy test instances publicly. This way you can add the authorization to the URL. See rationale in #327

Closes #327

If we also land #333, I will rebase this on top and also expose this feature as command line flags.

I also thought this could be implemented as a falcon middleware. But wanted to get feedback first whether or not it should be included at all.

[codecov]

Codecov Report

Attention: Patch coverage is 98.59155% with 1 line in your changes missing coverage. Please review.

Project coverage is 93.86%. Comparing base (18d3ad7) to head (b553064).
Report is 41 commits behind head on main.

Files with missing lines	Patch %	Lines
src/keria/app/agenting.py	95.83%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #334      +/-   ##
==========================================
+ Coverage   93.06%   93.86%   +0.79%     
==========================================
  Files          36       36              
  Lines        7121     8147    +1026     
==========================================
+ Hits         6627     7647    +1020     
- Misses        494      500       +6     

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[2byrds]

lgtm