add on new intent override plugin for expo android

[f0wu5u]

In reaction to this issue #558 and this closed PR #559.

This adds the;

import android.content.intent

override fun onNewIntent(intent: Intent?) {
    super.onNewIntent(intent)
    setIntent(intent)
  }

by default if import android.content.intent is not already in MainActivity and if override fun onNewIntent(intent: Intent?) is not already implemented.

This ultimately resolves issue with expo android not opening deeplinks when app is in background

cc: @iway1