Sandbox test viewing multiple NFTs at once

[bestatigen]

Call nft_tokens_owner on a user with more than a few NFTs, and make sure it works with the gas amounts. It shouldn't raise issues as it is only a view call at the moment, but the test should push the limits to see if anything breaks while trying to retrieve too many NFTs. If other edge cases come to mind, let's add them too.

Links

• NEAR Sandbox docs
• Simple example of Sandbox test

[bestatigen]

Seems like the limit is 8 :) Need to separate Metadata from Token.

[bestatigen]

Closed in #131