feat: add custom attributes to saml response

[stebenz]

Definition of Ready

• [ ] I am happy with the code
• [ ] Short description of the feature/issue is added in the pr description
• [ ] PR is linked to the corresponding user story
• [ ] Acceptance criteria are met
• [ ] All open todos and follow ups are defined in a new ticket and justified
• [ ] Deviations from the acceptance criteria and design are agreed with the PO and documented.
• [ ] No debug or dead code
• [ ] My code has no repetitions
• [ ] Critical parts are tested automatically
• [ ] Where possible E2E tests are implemented
• [ ] Documentation/examples are up-to-date
• [ ] All non-functional requirements are met
• [ ] Functionality of the acceptance criteria is checked manually on the dev system.

[codecov[bot]]

Codecov Report

Merging #56 (3bdfd7a) into main (cc9378c) will decrease coverage by 0.01%. The diff coverage is 47.36%.

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
- Coverage   47.26%   47.26%   -0.01%     
==========================================
  Files          21       21              
  Lines        1976     1993      +17     
==========================================
+ Hits          934      942       +8     
- Misses        984      993       +9     
  Partials       58       58              

Files Changed	Coverage Δ
pkg/provider/login.go	57.57% <0.00%> (ø)
pkg/provider/attributes.go	73.41% <47.05%> (-7.23%)	:arrow_down:
pkg/provider/metadata.go	52.94% <100.00%> (ø)

[github-actions[bot]]

:tada: This PR is included in version 0.1.0 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket: