Supporting to distinguish multiple consent forms during onboarding via an identifier (#50)

[RealLast]

Support for storing multiple consent forms (#50)

:recycle: Current situation & Problem

Closes #50 In the case of multiple OnboardingConsentView, it was impossible to distinguish the individual consent forms when storing in the Standard, as the "store" function of the OnboardingConstraint only receives a PDFDocument as a parameter and no additional information.

:gear: Release Notes

• Added a parameter "identifier" to OnboardingConsentView and OnboardingConstraint.
• If an identifier is specified when creating an `OnboardingConsentView', then the store function will be called with that identifier; otherwise the identifier is set to the default value "DefaultConsentDocument".
• UITests/TestApp has been changed accordingly to test the new functionality of having multiple (in this case two) consent forms.
  • Added "First" and "Second" Test View and Rendering View
  • ExampleStandard has been changed to distinguish the two consent forms based on their identifiers "FirstConsentDocument" and "SecondConsentDocument"

:books: Documentation

*Documented changes in the appropriate Markdown files.

:white_check_mark: Testing

• Adapted UI Test app to include a second OnboardingConsentView with an identifier different from the first one.

If you accept this PR, there are implications for SpeziTemplateApplication and SpeziStudyApplication, as both use an OnboardingConsentView and require to add the "identifier" parameter to the respective Standard. I am happy to make those changes if this PR gets accepted.

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[RealLast]

Thank you very much @PSchmiedmayer for the detailed and thoughtful feedback! I went over it carefully and incorporated your suggestions. I have also added a reply to most of your comments, including some considerations.

Regarding the failing test, I saw that we got the following error on iPadOS. "The request was denied by service delegate (SBMainWorkspace) for reason: NotFound ("Application "edu.stanford.spezi.onboarding.testappuitests.xctrunner" is unknown to FrontBoard")"

I am not sure how to solve this, can I do anything on my side to fix this?

Thanks again!