Benchmark CLI `event based APIs` and `pure python implementation dump/load APIs' are same right now.

[cheqianh]

Currently ion-python-benchmark-cli event based APIs are basically pure python implementation dump/load APIs.

So, below two commands are same.

python-benchmark-cli read --api event
python-benchmark-cli read --api simple_ion --c-extension False

This is because simple_ion modules uses pure python event based API by default when C extension is disabled.

So What?

We need to either combine them or separate them when we start work on the improvement of the event based APIs. Open this issue for visibility.