wip: New endpoint auth type to create http message signatures for outbound requests according to RFC 9421

[dadrus]

Related issue(s)

closes #1493

Checklist

• [x] I agree to follow this project's Code of Conduct.
• [x] I have read, and I am following this repository's Contributing Guidelines.
• [x] I have read the Security Policy.
• [x] I have referenced an issue describing the bug/feature request.
• [ ] I have added tests that prove the correctness of my implementation.
• [ ] I have updated the documentation.

Description

TODO

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 94.73684% with 10 lines in your changes missing coverage. Please review.

Project coverage is 89.81%. Comparing base (2577f56) to head (f81be24). Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...s/endpoint/authstrategy/http_message_signatures.go	94.95%	6 Missing :warning:
...ules/endpoint/authstrategy/mapstructure_decoder.go	88.00%	2 Missing and 1 partial :warning:
...hanisms/authenticators/basic_auth_authenticator.go	80.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1507      +/-   ##
==========================================
+ Coverage   89.72%   89.81%   +0.09%     
==========================================
  Files         270      271       +1     
  Lines        9012     9154     +142     
==========================================
+ Hits         8086     8222     +136     
- Misses        685      691       +6     
  Partials      241      241              

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[dadrus]

Work on this PR will continue as soon as #1534 is merged