Add basic plans + docs for Jungfrau commissioning

[olliesilvester]

Using the ophyd-async jungfrau device, we should start adding some plans from the old commissioning branch

Some of the most useful ones are:

• do_darks
• do_pedestal_darks
• do_manual_acquisition

Future plans that also may be needed in future PR but need discussion with scientists:

• rotation_scan_plan
• do_burst_mode

This will also require adding some devices to i24 on dodal

Acceptance Criteria

• Useful plans added
• Add a "setup ipython" script so that scientists can easily trigger plans
• Add scientist-facing docs for using mx-bluesky to trigger jungfrau data collections