Update the GodotHost interface to support signing and verifying Android apks

Update the export logic to enable apk generation and signing for Android editor builds

Note: Only legacy builds are supported. Gradle builds are not supported at this point in time.

editor/editor_paths.cpp

@@ -71,7 +71,11 @@ String EditorPaths::get_export_templates_dir() const {
 }
 
 String EditorPaths::get_debug_keystore_path() const {
+#ifdef ANDROID_ENABLED
+	return "assets://keystores/debug.keystore";
+#else
 	return get_data_dir().path_join("keystores/debug.keystore");
+#endif
 }
 
 String EditorPaths::get_project_settings_dir() const {