Rename argument ev to event (#3695)

## Description

This PR removes the following warning when building the app in release
mode for Android:

```
> Task :react-native-gesture-handler:compileReleaseKotlin
w: file:///Users/tomekzaw/(...)/node_modules/react-native-gesture-handler/android/src/main/java/com/swmansion/gesturehandler/react/RNGestureHandlerRootView.kt:41:43 The corresponding parameter in the supertype 'ReactViewGroup' is named 'ev'. This may cause problems when calling this function with named arguments.
```

## Test plan

<!--
Describe how did you test this change here.
-->

Author: tomekzaw

packages/react-native-gesture-handler/android/src/main/java/com/swmansion/gesturehandler/react/RNGestureHandlerButtonViewManager.kt

@@ -262,13 +262,13 @@ class RNGestureHandlerButtonViewManager :
       }
     }
 
-    override fun onInterceptTouchEvent(ev: MotionEvent): Boolean {
-      if (super.onInterceptTouchEvent(ev)) {
+    override fun onInterceptTouchEvent(event: MotionEvent): Boolean {
+      if (super.onInterceptTouchEvent(event)) {
         return true
       }
       // We call `onTouchEvent` and wait until button changes state to `pressed`, if it's pressed
       // we return true so that the gesture handler can activate.
-      onTouchEvent(ev)
+      onTouchEvent(event)
       return isPressed
     }
 

packages/react-native-gesture-handler/android/src/main/java/com/swmansion/gesturehandler/react/RNGestureHandlerRootHelper.kt

@@ -115,12 +115,12 @@ class RNGestureHandlerRootHelper(private val context: ReactContext, wrappedView:
     }
   }
 
-  fun dispatchTouchEvent(ev: MotionEvent): Boolean {
+  fun dispatchTouchEvent(event: MotionEvent): Boolean {
     // We mark `mPassingTouch` before we get into `mOrchestrator.onTouchEvent` so that we can tell
     // if `requestDisallow` has been called as a result of a normal gesture handling process or
     // as a result of one of the gesture handlers activating
     passingTouch = true
-    orchestrator!!.onTouchEvent(ev)
+    orchestrator!!.onTouchEvent(event)
     passingTouch = false
     return shouldIntercept
   }

packages/react-native-gesture-handler/android/src/main/java/com/swmansion/gesturehandler/react/RNGestureHandlerRootView.kt

@@ -37,10 +37,10 @@ class RNGestureHandlerRootView(context: Context?) : ReactViewGroup(context) {
     rootHelper?.tearDown()
   }
 
-  override fun dispatchTouchEvent(ev: MotionEvent) = if (rootViewEnabled && rootHelper!!.dispatchTouchEvent(ev)) {
+  override fun dispatchTouchEvent(event: MotionEvent) = if (rootViewEnabled && rootHelper!!.dispatchTouchEvent(event)) {
     true
   } else {
-    super.dispatchTouchEvent(ev)
+    super.dispatchTouchEvent(event)
   }
 
   override fun dispatchGenericMotionEvent(event: MotionEvent) =