Add strict mode in sample app and call lifecycle method on main thread

[aleksandar-apostolov]

Goal

Lifecycle register should be called on the main thread.

Implementation

Inside start and stop use a utility function runOnMainThread which ensures the Looper.mainLooper() is used.

Testing

Run the sample and ensure that the lifecycle is registered

Checklist

• Issue linked (if any)
• Tests/docs updated
• I have signed the Stream CLA (required for external contributors)

[github-actions]

PR checklist ✅

All required conditions are satisfied:

• Title length is OK (or ignored by label).
• At least one pr: label exists.
• Sections ### Goal, ### Implementation, and ### Testing are filled.

🎉 Great job! This PR is ready for review.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud