[WalletKit] Investigate moving nft-engine functions to walletkit

[mikeplotean]

Functions to be added:

• [ ] mint token
• [ ] update token metadata
• • redeem / verify token
• [ ] have the business logic provided externally (e.g. nft-engine or another engine configured in setup):
• • the right to mint (e.g. based on supply or user access - user not registered or token already minted)
• • the rules for token verification (e.g. value for redeemed, allowed values)