LIT-3897 - Implement pruning of expired capacity token NFTs

[MaximusHaximus]

• Adds a call to pruneExpired() function that will be called after minting a new NFT to a target address
• This will keep performance from being degraded if our target accounts don't ever clean up existing, expired RLI NFTs manually on their end.

NOTE: This needs a new ABI update for the contract because pruneExpired() is a new method. Once we know which js-sdk version we need for that, we can bump the version of @lit-protocol/contracts-sdk here and ship this feature.