Added SDL_EVENT_SCREEN_KEYBOARD_SHOWN and SDL_EVENT_SCREEN_KEYBOARD_HIDDEN

Fixes https://github.com/libsdl-org/SDL/issues/13049

android-project/app/proguard-rules.pro

@@ -30,7 +30,6 @@
     boolean isAndroidTV();
     boolean isChromebook();
     boolean isDeXMode();
-    boolean isScreenKeyboardShown();
     boolean isTablet();
     void manualBackButton();
     int messageboxShowMessageBox(int, java.lang.String, java.lang.String, int[], int[], java.lang.String[], int[]);