Don't start sessions when ReactNative apps are loaded in the background

[lemnik]

Goal

Don't start/resume sessions in ReactNative apps when the bundle is pre-loaded in the background (leaving it to the native layer to start the session when appropriate).

Changeset

Replace the resumeSession call in the ReactNative Bugsnag.start implementation with a new NativeClient.resumeSessionOnStartup call. The Android native layer first checks that the app is in the foreground before calling resumeSession as normal.

Testing

Manually tested using system broadcasts.

[github-actions]

@bugsnag/browser bundle size diff

	Minified	Minfied + Gzipped
Before	43.80 kB	13.43 kB
After	43.80 kB	13.43 kB
±	No change	No change

code coverage diff

<temporarily disabled>

Generated by 🚫 dangerJS against 6af8054

[yousif-bugsnag]

looks good to me