Update LifecycleHandler to Use Scene Methods

[PSchmiedmayer]

Update LifecycleHandler to Use Scene Methods

♻️ Current situation & Problem

• The current Lifecycle methods in the Spezi LifecycleHandlers are not properly called and do not reflect the latest advancements on iOS to use the UISceneDelegate

💡 Proposed solution

• Deprecates the current application lifecycle methods in favor for scene-related methods
• Adds tests to test the lifecycle methods

Code of Conduct & Contributing Guidelines

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

[codecov]

Codecov Report

Merging #67 (a81cb2c) into main (57ddc03) will increase coverage by 0.30%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #67      +/-   ##
==========================================
+ Coverage   89.38%   89.68%   +0.30%     
==========================================
  Files          29       29              
  Lines         593      610      +17     
==========================================
+ Hits          530      547      +17     
  Misses         63       63              

Impacted Files	Coverage Δ
...dule/Capabilities/Lifecycle/LifecycleHandler.swift	100.00% <100.00%> (ø)
...pabilities/Lifecycle/Spezi+LifecycleHandlers.swift	100.00% <100.00%> (ø)
Sources/Spezi/Spezi/SpeziAppDelegate.swift	96.56% <100.00%> (+0.72%)	⬆️

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