feat: Include 'hittable' attribute (#1918)

Author: mykola-mokhnach

docs/element-attributes.md

@@ -17,5 +17,4 @@ selected | Whether the element is [selected](https://developer.apple.com/documen
 index | Element's index in the hierarchy relatively to its parent. Only available since Appium 1.20.0. Indexing starts from `0`. | '2'
 rect | Element's rectangle. The actual data of this attribute is based on element's [frame](https://developer.apple.com/documentation/xctest/xcuielementattributes/1500911-frame?language=objc). | {'x': 0, 'y': 0, 'width': 100, 'height': 100}
 value | Element's value. This is a complex attribute, whose calculation algorithm depends on the actual element type. Check [WebDriverAgent sources](https://github.com/appium/WebDriverAgent/blob/master/WebDriverAgentLib/Categories/XCUIElement%2BFBWebDriverAttributes.m) to know more about how it is compiled (method `- (NSString *)wdValue`). Could be `null` | 'hello'
-
-
+hittable | Whether the element is [hittable](https://developer.apple.com/documentation/xctest/xcuielement/1500561-hittable). This attribute is not included into the XML page source due to performance reasons, although you can use it in element locators or fetch its value using [getAttribute](https://www.w3.org/TR/webdriver2/#get-element-attribute) API. *Only available since driver version 4.35*.  | 'true'

package-lock.json

@@ -73,7 +73,7 @@
     "appium-ios-device": "^2.5.4",
     "appium-ios-simulator": "^5.1.3",
     "appium-remote-debugger": "^10.0.0",
-    "appium-webdriveragent": "^5.6.0",
+    "appium-webdriveragent": "^5.8.0",
     "appium-xcode": "^5.1.4",
     "async-lock": "^1.4.0",
     "asyncbox": "^2.9.4",