refactor: rename MxSplashScreen to MendixSplashScreen for consistency

Author: YogendraShelke

example/__tests__/splash-screen.harness.ts

@@ -1,5 +1,5 @@
 import { describe, test, expect } from 'react-native-harness';
-import { MxSplashScreen as MendixSplashScreen } from 'mendix-native';
+import { MendixSplashScreen } from 'mendix-native';
 
 describe('MendixSplashScreen', () => {
   describe('API surface', () => {

src/splash-screen/index.ts

@@ -1,6 +1,6 @@
 import NativeMxSplashScreen from './NativeMxSplashScreen';
 
-export const MxSplashScreen = {
+export const MendixSplashScreen = {
   show(): void {
     NativeMxSplashScreen.show();
   },