TextInput: Add onPressIn and onPressOut

Summary:
Introduces support for `onPressIn` and `onPressOut` on the `TextInput` component.

This makes it possible to add visual feedback when users touch interact with `TextInput` components.

Changelog:
[General][Added] - TextInput now supports `onPressIn` and `onPressOut`.

Reviewed By: TheSavior

Differential Revision: D23514333

fbshipit-source-id: 1790e977b78f1c293d5476aef8613547f27d6731

Libraries/Components/TextInput/TextInput.js

@@ -571,6 +571,16 @@ export type Props = $ReadOnly<{|
    */
   onEndEditing?: ?(e: EditingEvent) => mixed,
 
+  /**
+   * Called when a touch is engaged.
+   */
+  onPressIn?: ?(event: PressEvent) => mixed,
+
+  /**
+   * Called when a touch is released.
+   */
+  onPressOut?: ?(event: PressEvent) => mixed,
+
   /**
    * Callback that is called when the text input selection is changed.
    * This will be called with
@@ -1135,6 +1145,8 @@ function InternalTextInput(props: Props): React.Node {
       <TouchableWithoutFeedback
         onLayout={props.onLayout}
         onPress={_onPress}
+        onPressIn={props.onPressIn}
+        onPressOut={props.onPressOut}
         accessible={props.accessible}
         accessibilityLabel={props.accessibilityLabel}
         accessibilityRole={props.accessibilityRole}