update mobile gesture APIs for XCUITest(WDA)

[KazuCocoa]

watching:

• Make all XCTest gestures available for "mobile:" interface appium-xcuitest-driver#393

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• https://github.com/appium/appium-xcuitest-driver/blob/af50aae1fc43208561b5b907927b474fed545a8b/lib/commands/execute.js#L29

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• options for mobile: scroll
  • https://github.com/facebook/WebDriverAgent/blob/dccf5c8fda793b9eaa26a41c4d5637cd42010730/WebDriverAgentLib/Commands/FBElementCommands.m#L235

[KazuCocoa]

https://github.com/mykola-mokhnach/appium/blob/3966c017d07118df259838b2473d3aeb8cc91387/docs/en/writing-running-appium/ios-xctest-mobile-gestures.md

[KazuCocoa]

TODO

• add documentations
  • https://github.com/appium/appium/blob/master/docs/en/writing-running-appium/ios-xctest-mobile-gestures.md
• update some helpful methods for XCUITest
  • swipe
  • pinch
  • doubleTap
  • twoFingerTap
  • tap
  • dragFromToForDuration

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Some methods are already implemented in ruby_lib

[KazuCocoa]

add mobile gesture for XCUITest #537 help users write test code without .ref for elements.
So, I'll merge it.