feat: define AppiumClientConfig #333

Job	Run time
ios_test (test/functional/ios/safari_tests.py, func_test_ios1)	6m 51s
android_test (test/functional/android/appium_service_tests.py test/functional/android/chrome_test...	3m 45s
flutter_e2e_test (macos-14, flutter-ios)	10m 50s
flutter_e2e_test (ubuntu-latest, flutter-android)	5m 4s
	26m 30s

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