fix(android): scope back callbacks to the view lifecycle

[likevy]

Summary

Fixes #457.

Android back callbacks survived RN fragment view destruction, retaining delegates and intercepting back presses after re-entry.

• Bind callbacks to the fragment view lifecycle and use the supplied owner for delegate lifecycle observation.
• Preserve the existing createView API, add a lifecycle-owner overload, and restore callback enablement after native fallback exceptions.

Test plan

1. Build RN AAR and AndroidApp example locally and run i.e. on API 35 simulator
2. Add temp/ mount/unmount button to repeat 10 RN fragment visits within the same Activity
3. Verify actual fragment view creation/destruction and that the Activity remained after each unmount
4. Verify back callbacks were enabled while RN was mounted and no enabled callbacks emained after each unmount