Separate android initialization from Activity (#11891)

android-project/app/proguard-rules.pro

@@ -16,7 +16,7 @@
 #   public *;
 #}
 
--keep,includedescriptorclasses,allowoptimization class org.libsdl.app.SDLActivity {
+-keep,includedescriptorclasses,allowoptimization class org.libsdl.app.SDLActivityComponent {
     java.lang.String nativeGetHint(java.lang.String); # Java-side doesn't use this, so it gets minified, but C-side still tries to register it
     java.lang.String clipboardGetText();
     boolean clipboardHasText();