[Cashtab] Support minting NFTs

Summary:
Support minting SLP1 NFT Child tokens, aka "NFTs"

• User can create "fan-out" txs to have qty-1 utxos available to mint NFTs
• User can mint NFTs
• NFTs are rendered with icon and some available info on the NFT Collection token action page
• An info notice is rendered on the NFT's token action page (we do not yet support NFT actions, like sending an NFT. Will come in a later diff).
• We parse NFT parent "fan-out" txs in tx history
• We parse NFT mints in tx history
• We start parsing "self-send" txs uniquely in tx history, for NFT-related txs and all txs

Test Plan:
npm test

npm start, make a collection, make some NFTs. note that, as you mint NFTs, they appear in the "NFTs in this Collection" table

This diff is deployed at https://cashtab-local-dev.netlify.app

Reviewers: #bitcoin_abc, emack

Reviewed By: #bitcoin_abc, emack

Subscribers: emack

Differential Revision: https://reviews.bitcoinabc.org/D16043