Make LocalStorage and SecureStorage Sendable

[Supereg]

Make LocalStorage and SecureStorage Sendable

♻️ Current situation & Problem

This PR adds Sendable conformance for both storage modules.

⚙️ Release Notes

• LocalStorage is now Sendable
• SecureStorage is now Sendable

📚 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

All modified and coverable lines are covered by tests ✅

Project coverage is 92.06%. Comparing base (9d04bc6) to head (d004ea5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #22   +/-   ##
=======================================
  Coverage   92.06%   92.06%           
=======================================
  Files           6        6           
  Lines         453      453           
=======================================
  Hits          417      417           
  Misses         36       36           

Files	Coverage Δ
Sources/SpeziLocalStorage/LocalStorage.swift	89.43% <ø> (ø)
Sources/SpeziSecureStorage/SecureStorage.swift	93.97% <ø> (ø)
...es/SpeziSecureStorage/SecureStorageItemTypes.swift	100.00% <ø> (ø)

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[PSchmiedmayer]

Thank you @Supereg for ensuring sendable conformance!