Ensure compatibility with C++ interoperability in Swift

[Supereg]

Ensure compatibility with C++ interoperability in Swift

:recycle: Current situation & Problem

Currently, ResearchKit fails to build when you have a project that enables C++ interoperability in Swift. This PR addresses these issues with some minor code changes.

:gear: Release Notes

• Ensure compatibility with C++ interoperability in Swift

:books: Documentation

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:white_check_mark: Testing

Manually verified that SpeziQuestionnaire builds and tests with these changes (with and without C++ interoperability enabled).

Code of Conduct & Contributing Guidelines

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[Supereg]

@PSchmiedmayer Seems like the build actions changed their name(?). Could you adjust the branch protection CI requirements?

[Supereg]

I documented the need to verify this in CI within #13.