Explore appium for at_client_mobile/flutter packages testing

[murali-shris]

Is your feature request related to a problem? Please describe.

• currently we don't have automation process to test flutter apps/packages

Describe the solution you'd like

• explore appium/flutter driver for flutter automation test

Describe alternatives you've considered

No response

Additional context

No response

[murali-shris]

PR 76 Local setup done for appium and trying out with a sample app. ref: https://medium.com/automationmaster/appium-mobile-app-automation-406bf8b0fd80

[purnimavenkatasubbu]

Integration tests are preferred more than flutter_driver https://docs.flutter.dev/release/breaking-changes/flutter-driver-migration

https://github.com/appium/appium-flutter-driver/issues/210