Rename internal getConstants method to prevent conflicts with RN's getConstants method (#5745)

Related to #4861

lib/android/app/src/main/java/com/reactnativenavigation/react/NavigationModule.java

     }
     
     @ReactMethod
-    public void getConstants(Promise promise) {
+    public void getNavigationConstants(Promise promise) {
         ReactApplicationContext ctx = getReactApplicationContext();
         WritableMap constants = Arguments.createMap();
         constants.putString(Constants.BACK_BUTTON_JS_KEY, Constants.BACK_BUTTON_ID);

lib/ios/RNNBridgeModule.m

 	resolve(args);
 }
 
-RCT_EXPORT_METHOD(getConstants:(RCTPromiseResolveBlock)resolve rejecter:(RCTPromiseRejectBlock)reject) {
+RCT_EXPORT_METHOD(getNavigationConstants:(RCTPromiseResolveBlock)resolve rejecter:(RCTPromiseRejectBlock)reject) {
 	resolve([Constants getConstants]);
 }
 

lib/src/adapters/Constants.ts

 
 export class Constants {
   static async get(): Promise<NavigationConstants> {
-    const constants: NavigationConstants = await NativeModules.RNNBridgeModule.getConstants();
+    const constants: NavigationConstants = await NativeModules.RNNBridgeModule.getNavigationConstants();
     return new Constants(constants);
   }