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]

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%)	⬇️
pkg/provider/metadata.go	52.94% <100.00%> (ø)

[github-actions]

🎉 This PR is included in version 0.1.0 🎉

The release is available on GitHub release

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