QueryLastPendingBatchRequestByAddr and QueryLastPendingLogicCallByAddr should both return arrays

[jkilpatr]

Right now

QueryLastPendingLogicCallByAddr
and
QueryLastPendingBatchRequestByAddr

return individual values, this crates a simple flow where the Orchestrator calls these endpoints, signs the latest result, and submits it.

This becomes a problem if batches or Logic calls are created faster than this loop operates. This actually has already been solved on the validator set flow, where we ran into this problem pretty quickly in our early testnets.

• Modify the query endpoints to return arrays of values
• Modify the orchestrator to submit signatures as a bundle of messages, preventing orchestrators from falling behind signing these newly created sets.