* disputes: Allow batch queries in dispute-coordinator
This commit moves to batch queries when responding to QueryCandidateVotes
messages. This simplifies the code in the provisioner and dispute-coordinator
by no longer requiring to make use of a FuturesOrdered when awaiting multiple
quries. Instead, the provisioner need only request the batch itself.
* node/approval-voting: Address Feedback to fail on query element missing.
* Address feedback
* Fix implementer's guide