Do energy changes in parallel to other set up

Beamline energy changes can be done in parallel with robot load, pin tip centre and grid detection. We should trigger the energy change as early as we can in the process and then wait for it before the xray centring step. However, the energy change is a plan in itself rather than just an `ophyd` device so to do this in parallel we would need https://github.com/bluesky/bluesky/issues/1652

## Acceptance Criteria
* Energy changes happen concurrently with other set up before xray centring