Support batching of inputs where appropriate #2
Description
Many API endpoints allow batch requests. Ideally it should be possible for connectors to be able to declare endpoint functions which can deal with batches of inputs in order to reduce the number of requests we send to APIs. The most obvious solution would be for those functions to accept an iterator as an argument instead of a single value, but this means that the endpoint function is then responsible for managing the output order, as well as rendering outputs in the correct format.