feat: add support for FlutterAndroidDriver

[sudharsan-selvaraj]

Change list

1. Introduces FlutterAndroidDriver class implementing specific Flutter commands(partial).

• waitForVisible
• waitForInvisible
• scrollTillVisible

3. Includes new tests and pipeline updates for running Flutter tests.
4. Note: Changes for IosDriver along with remaining commands will follow in a separate PR.

Types of changes

What types of changes are you proposing/introducing to Java client?
Put an x in the boxes that apply

• No changes in production code.
• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Details

Please provide more details about changes if it is necessary. If there are new features you can provide code samples which show the way they
work and possible use cases. Also you can create gists with pasted java code samples or put them here using markdown.
About markdown please read Mastering markdown and Writing on GitHub

[valfirst]

why are these changes needed?

[sudharsan-selvaraj]

Currenlty all flutter script can only work with locators supported by flutter driver. This change is specifically introduced the simplify the API consumption and to prevent the manual type casting when calling the commands.

driver.waitForInVisible(new WaitParameter().setLocator(AppiumBy.flutterKey("message_field")));

Instead of

driver.waitForInVisible(new WaitParameter().setLocator((AppiumBy.FlutterBy)AppiumBy.flutterKey("message_field")));