Fix visibility of NotificationHandler default implementations and make Delegate methods open

[Supereg]

Fix visibility of NotificationHandler default implementations and make Delegate methods open

♻️ Current situation & Problem

The NotificationHandler provides empty default implementations but their implementation are not marked public. Therefore, they have no effect. Secondly, some SpeziAppDelegate methods are not declared as open. This reduces flexibility in certain cases where it might be helpful to inject custom logic or even just to debug some issues.

⚙️ Release Notes

• Fixed default implementation of the NotificationHandler.
• Make all SpeziAppDelegate methods open.

📚 Documentation

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✅ Testing

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📝 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.

[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 84.97%. Comparing base (ce8b29f) to head (e32b690).

❗ Current head e32b690 differs from pull request most recent head 06b5dc4. Consider uploading reports for the commit 06b5dc4 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #102   +/-   ##
=======================================
  Coverage   84.97%   84.97%           
=======================================
  Files          41       41           
  Lines         951      951           
=======================================
  Hits          808      808           
  Misses        143      143           

Files	Coverage Δ
Sources/Spezi/Spezi/SpeziAppDelegate.swift	90.91% <100.00%> (ø)
...pabilities/Notifications/NotificationHandler.swift	50.00% <50.00%> (ø)

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[PSchmiedmayer]

Thank you for this fix!