Support for Single-Sign-On Provider

[Supereg]

Support for Single-Sign-On Provider

♻️ Current situation & Problem

Currently, we only support an E-Mail-Password-based authentication. SpeziAccount and SpeziFirebase just recently added support for Sign in with Apple. This PR incorporates those updated libraries.

⚙️ Release Notes

• Added support for Sign in with Apple

📚 Documentation

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✅ Testing

Similar to SpeziFirebase, we do not test Sign in with Apple in the Simulator directly as this cannot really be reliably achieved. Current test cases cover all the other changes made in this PR.

📝 Code of Conduct & Contributing Guidelines

By submitting creating this pull request, you agree to follow our Code of Conduct and Contributing Guidelines:

• I agree to follow the Code of Conduct and Contributing Guidelines.

[PSchmiedmayer]

Thank you for the improvement, happy to merge this as discussed in the meeting!

[codecov]

Codecov Report

Merging #45 (2971236) into main (cf19568) will decrease coverage by 0.69%.
The diff coverage is 96.37%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #45      +/-   ##
==========================================
- Coverage   82.49%   81.80%   -0.69%     
==========================================
  Files          36       35       -1     
  Lines         988      978      -10     
==========================================
- Hits          815      800      -15     
- Misses        173      178       +5     

Files	Coverage Δ
...mplateApplication/Account/AccountSetupHeader.swift	100.00% <100.00%> (ø)
TemplateApplication/Account/AccountSheet.swift	84.91% <100.00%> (+3.09%)	⬆️
TemplateApplication/Home.swift	100.00% <100.00%> (ø)
...lateApplication/Onboarding/AccountOnboarding.swift	88.89% <100.00%> (-11.11%)	⬇️
TemplateApplication/TemplateApplication.swift	100.00% <100.00%> (ø)
...plateApplication/TemplateApplicationStandard.swift	51.64% <100.00%> (+0.40%)	⬆️
TemplateApplication/TemplateAppDelegate.swift	96.16% <80.00%> (-1.67%)	⬇️

... and 1 file with indirect coverage changes

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