Enable SwiftConcurrency feature in new compilers

[Supereg]

Enable SwiftConcurrency feature in new compilers

♻️ Current situation & Problem

This PR makes sure to enabled the SwiftConcurrency feature also with Swift 6 compilers.
Further, we add SwiftLint if requested from the environment.

⚙️ Release Notes

• Support SwiftConcurrency in Swift 6 compilers´
• Add SwiftLint build tool if SPEZI_DEVELOPMENT_SWIFTLINT environment variable is set.

📝 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 81.14%. Comparing base (656f765) to head (a210479).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #11   +/-   ##
=======================================
  Coverage   81.14%   81.14%           
=======================================
  Files          11       11           
  Lines         281      281           
=======================================
  Hits          228      228           
  Misses         53       53           

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[PSchmiedmayer]

Looks great; good to see that there were no code changes needed.