Benchmarking methods added for:

* stream inserts using tuples of time, value data
* stream inserts using pyarrow tables of timestamps, value columns

* streamset inserts using a dict map of streamset stream uuids, and lists of tuples of time, value data
* streamset inserts using a dict map of streamset stream uuids, and pyarrow tables of timestamps, values.

* This was the only difference in the schemas between go and python.
* also using a bytesIO stream to act as the sink for the ipc bytes.