Support listing ALP tokens on Agora
Note that buys and cancels work, as these functions are just using already-tested library methods that use AgoraOffer as an input param (so, adjust "automagically" for ALP vs SLP).
The only different tx type is the listing tx. We add and test a new helper function for creating these target outputs.
Agora list txs need special parsing vs SLP list txs. Add that too.