onKeyPress is not fired on Android when entering an Emoji (#24717)

Summary:
Resolve #24690

This is very simple unicode detecting. Should I improve this solution creating StringsUtils for detecting unicodes in whole react-native project ?

[Android][Fixed] onKeyPress method is calling, when user type emoji
Pull Request resolved: #24717

Differential Revision: D15238388

Pulled By: cpojer

fbshipit-source-id: 038b1040e1c44fd6f9401a3988a782f5778e1209

Author: Piotr Trocki

ReactAndroid/src/main/java/com/facebook/react/views/textinput/ReactEditTextInputConnectionWrapper.java

@@ -108,8 +108,8 @@ public boolean setComposingText(CharSequence text, int newCursorPosition) {
   @Override
   public boolean commitText(CharSequence text, int newCursorPosition) {
     String key = text.toString();
-    // Assume not a keyPress if length > 1
-    if (key.length() <= 1) {
+    // Assume not a keyPress if length > 1 (or 2 if unicode)
+    if (key.length() <= 2) {
       if (key.equals("")) {
         key = BACKSPACE_KEY_VALUE;
       }