Rewarded Ads?

[ItzNotABug]

• Will require an external dependency to a Video Player (most preferably ExoPlayer)
• Add a CountDown for the reward time limit at the top of Ad, maybe a Splash Image at the end
• Ad Reward no more than 15 seconds
• Override backpress & show a dialog stating to complete the Ad, if not already
• Hit a callback once the Ad is closed on Reward completion

This will be added in a different module, as importing this into the existing base just means adding ExoPlayer
& bloating the library, if someone doesn't use Rewarded Ads.

This is a lot of work, so this will take some time in setting up a dev branch with this.