Prototype an 'expand all' NFT option for the Collectables view

Add a prototype 'expand NFT' switch, similar to the one in the NFTActivity fragment view where you can see all the NFTs on an account, switching between different view styles.

I'm thinking something like this:
(Note that it shouldn't be an option button as I did in the picture - that is for context to show something switched; tuck it away in the menu!)


Some way of switching between the summary view, and the expanded view (taken from Rainbow wallet):


There's currently no design, so for now tuck the switch away in the normal Android top right menu so most people won't discover it, so the work is ready for when we have the design. Should this option be available globally or only when the collectables fragment is in view? I remember reading that you shouldn't change the options based on the view because people will be searching for it when they're not in the collectables view. We should remember which option is selected too.

The way Rainbow puts the Token icon (eg Bufficorn, Enjin) as a small icon and has the token contract ```Token.getFullName()``` as a spacer between the expansions is a good touch.