Batch circuit uploading

[vardhini-quantinuum]

A protocol can generate a lot of circuits in InQuanto and when we upload circuits to get back a circuit ref, we do this one at a time. This means that more calls are being made to the Nexus service than required.

If we could upload a list of circuits to Nexus in one go, this might speed things up a lot.

[vanyae-cqc]

users have also reported that the server crashes when submitting jobs with lots of circuit refs. Worth looking into as part of this effort