Host Job RefundsList
PROGRAMMING TASK
Description of Task
Have the host keep a list of recent jobs so the renter can query refunds
Reason or Need for Change
Renter will want to query if it got a refund in case the host dropped a connection or an RPC did not succeed for whatever reason.
Design / Proposal
Use the cancellation token which we'll rename to something more generic (like job uid) so we can re-use it for the refunds. Keep refunds in memory (no persistence) for a certain period of time (e.g. 5')