Fix TextInput never unset MovementMethod

Summary:
Since we never unset `MovementMethod` when we unmount `EditText`:

https://www.internalfb.com/code/fbsource/[c3c455bf992e271a11603f404e7de719868be3da]/fbandroid/libraries/components/litho-widget/src/main/java/com/facebook/litho/widget/TextInputSpec.java?lines=942-949

We could potentially face a situation where the `TextView.layout` has been released when we're dealing with logic inside the callback `MovementMethod`, for example:

https://www.internalfb.com/code/fbsource/[c0dfc5d86d8051e0861c1abc35cb0e9647c6fd00]/fbandroid/java/com/facebook/widget/text/BetterLinkMovementMethod.kt?lines=30-68

It might lead to a crash like this: https://fburl.com/logview/9cgol7zq

Reviewed By: jettbow

Differential Revision: D67088678

fbshipit-source-id: 633af90a840ba08ac4b79acce8368ce0a3ebac8b

litho-core/src/main/java/com/facebook/litho/config/ComponentsConfiguration.kt

@@ -296,6 +296,9 @@ internal constructor(
      */
     @JvmField var enableA11Y: Boolean = false
 
+    /** This flag is used clear MovementMethod on TextInput to avoid a potential crash. */
+    @JvmField var clearMovementMethod: Boolean = true
+
     /**
      * This method is only used so that Java clients can have a builder like approach to override a
      * configuration.

litho-widget/src/main/java/com/facebook/litho/widget/TextInputSpec.java

@@ -943,6 +943,9 @@ static void onUnmount(
       editText.setKeyListener(null); // Clear any KeyListener
       editText.setInputType(inputType); // Set the input type back to default.
     }
+    if (ComponentsConfiguration.clearMovementMethod) {
+      editText.setMovementMethod(null);
+    }
     editText.setTextState(null);
     editText.removeOnWindowFocusChangeListener();
     editText.setPrivateImeOptions(null);