Async RPC Calls

[CyrusVorwald]

A lot of the RPC batch operations (like in pool_prices.py) are making synchronous calls in loops. They should instead be called async.

[robcxyz]

Every RPC call needs to be replaced with a new client we built. When going async then all the RPC calls should be upgraded then. When still building jobs in sync, then going async on a lot of the json rpc stuff will have little impact as we're not generally making a lot of calls / have a cache for things which do not change (ie decimals)

The slowest part of the syncs is DB interactions, not json rpc calls generally speaking.