feat: add a capability of waitForLaunch

[KazuCocoa]

Closes appium/appium#12962

appium-adb already has an option, waitForLaunch, to remove -W for instrument command.
waitForLaunch is true by default.

This PR add the ability for UIA2.

• With appWaitForLaunch

[debug] [ADB] Running '/Users/kazu/Library/Android/sdk/platform-tools/adb -P 5037 -s emulator-5554 shell am start -n io.appium.android.apis/io.appium.android.apis.ApiDemos -S -a android.intent.action.MAIN -c android.intent.category.LAUNCHER -f 0x10200000'

• Without appWaitForLaunch (or true)

[debug] [ADB] Running '/Users/kazu/Library/Android/sdk/platform-tools/adb -P 5037 -s emulator-5554 shell am start -W -n io.appium.android.apis/io.appium.android.apis.ApiDemos -S -a android.intent.action.MAIN -c android.intent.category.LAUNCHER -f 0x10200000'

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Espresso driver does not call startApp, so this change is needed for this repo.

[KazuCocoa]

Will add this cap in caps for in Appium repo after merging this change.