App crashes when trying to start Bugsnag on Watch app

[gpambrozio]

Describe the bug

When trying to start Bugsnag on a Watch app (not an extension) the app crashes when trying to call [WKExtension sharedExtension] as this only works on extensions, not on a watch app that can run as a standalone app.

Steps to reproduce

1. On latest XCode, create a new Apple Watch app.
2. Follow instructions to integrate Bugsnag
3. Run app
4. XCode will stop at the crash mentioned above

Environment

• Bugsnag version: 6.27.2
• watchOS version(s): 9
• Simulator or physical device: Any watch
• Xcode version: 14.3.1

Crash screenshot:

[clr182]

Hi @gpambrozio
We appreciate your feedback and thank you for opening a PR to address this issue.
We will be sure to review your PR once priorities allow.