Remove need for each platform to implement ToastAndroid as Unimplemen…

…tedView (#38606)

Summary:
Pull Request resolved: #38606

Today, any host platform implementation of React Native must add ToastAndroid.platform.js.

- https://github.com/microsoft/react-native-macos/blob/main/Libraries/Components/ToastAndroid/ToastAndroid.macos.js
- https://github.com/microsoft/react-native-windows/blob/0.71-stable/vnext/src/Libraries/Components/ToastAndroid/ToastAndroid.windows.js

Now they don't have to do it anymore.

Changelog:
[General] [Fixed] - ToastAndroid] Remove need for each platform to implement ToastAndroid as UnimplementedView

Reviewed By: rozele

Differential Revision: D47744187

fbshipit-source-id: 510aa7aa00a768ba5a37f3d40246f7ef620e0b58