Create device for the two detector slits and scaler card, create a plan to do fly scan and step scan.

[Relm-Arrowny]

Goals

• Add the two detector slits and scaler card using ophyd_ascync
  1. All motor should be flyable type.
  2. All detector should should auto scale/gain
  3. Should also have sim mode to test logic

Tasks

• Make detector slits device
• Make scaler card into device
• Create rs232 interface and control current amplifier.
• Dynamically change current amplifier gain
• putting everything together to perform detector slits scans.
• Auto alignment of slits.

[Relm-Arrowny]

devices are now all in dodal rather than here, and this is linked to DiamondLightSource/dodal#811