[feat]: Add CI workflow to run tests

[johnkodes]

Changes:

• Adds a workflow that should run tests on different versions of iOS + MacOS and also with different Xcodes.
  • Triggered on PRs and pushes to master
• Adds test results via https://github.com/kishikawakatsumi/xcresulttool
  • only for iOS because macOS uses swift test instead of xcodebuild which is faster twice faster

Limitations:

• We cannot test lower iOS versions because we build using Swift 5.9 (which requires Xcode 15) and the Github Runners don't have older simulators installed. https://github.com/actions/runner-images/blob/main/images/macos/macos-13-Readme.md#xcode
• We cannot test the macOS version via swift test because the loading of files fails (resources are handled differently when running swift test vs xcodebuild). When running swift test they are not compiled into Assets.car which might be the reason why we are unable to load the file via NSDataAsset (in MockResponseProvider) but I haven't debugged that far to know that for sure.

[cejanen]

Leaving few more questions/comments Ω

[matejmolnar]

📝

[johnkodes]

@matejmolnar @cejanen I hope you noticed but just to be sure that you've seen results that were added as part of this PR as well 😄

• https://github.com/strvcom/ios-networking/pull/62/checks?check_run_id=20976997060&pr=62
• https://github.com/strvcom/ios-networking/pull/62/checks?check_run_id=20976737145&pr=62

Found the checks:

[johnkodes]

@cejanen @matejmolnar Few more changes added in the tests. Let's have a look again please. Possibly the last review 😄

[cejanen]

👍

[matejmolnar]

💪