Enable Export and Storage of Signed Consent Form

[philippzagar]

Problem

At the moment, the application provides a consent form that users are required to sign, without storing the completed form.
However, in order to make LLMonFHIR ready for a planned usability study, the study supervisors must be able to access the signed form in retrospect (for legal purposes). I
n addition, study participants must have the ability to re-access the document they signed within the onboarding flow.

Solution

The application needs to store the signed form, accessible for the study supervisors but also the study participants.
The SpeziOnboarding package provides the functionality to export the signed consent form since StanfordSpezi/SpeziOnboarding#26. This will be especially useful for implementing the required functionality.
The document itself must be stored securely, so locally via the SpeziStorage and/or remote via SpeziFirebase.

Additional context

Keep in mind that StanfordSpezi/SpeziOnboarding#26 introduced breaking changes to the public API of the SpeziOnboarding module!

Code of Conduct

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