Limit Order Mint Service

[ryley-o]

(based off of this conversation, but changed to a service instead of a minter): https://discord.com/channels/411959613370400778/763407935127945226/991088867979427901 - Thanks @proximo!)

A service that allows users to preemptively submit a tx/sign an approval along the lines of "I am willing to pay xΞ to mint a token on project y, and someone else (an arbitrager) to mint a token to them on their behalf.

This logic is probably best suited as a separate service, outside of our minter suite. This would let it be able to be used for all types of minters because at its core, a user is simply bidding on the right to mint a token, and allowing any arbitrager to perform the transaction.

The benefit of this type of service would be to remove the requirement for a user to be actively online during a drop. Users could submit their fire-and-forget their bids beforehand, resulting in a more efficient market. The small cost of paying an arbitrager to perform the transaction is likely highly net positive for many users.

Note that all bids would be public and cancellable to prevent any possibility of any party having any unfair advantages.

Cc @jakerockland