Hyperion 1474: Save the Panda

[rtuck99]

Part of DiamondLightSource/hyperion#1474

Instructions to reviewer on how to test:

1. This should install a new cli command save-panda, that when run on a beamline workstation with the name of the panda device and an output filename, will save the device state as a yaml file

Checks for reviewer

• Would the PR title make sense to a scientist on a set of release notes
• If a new device has been added does it follow the standards
• If changing the API for a pre-existing device, ensure that any beamlines using this device have updated their Bluesky plans accordingly
• Have the connection tests for the relevant beamline(s) been run via dodal connect ${BEAMLINE}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.33%. Comparing base (0df1ecd) to head (6c7f7a4).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #702      +/-   ##
==========================================
+ Coverage   94.24%   94.33%   +0.09%     
==========================================
  Files         110      111       +1     
  Lines        4399     4469      +70     
==========================================
+ Hits         4146     4216      +70     
  Misses        253      253              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[olliesilvester]

My main comment is I think this should be specifically for saving the panda, rather than a generic device save. Let me know if you disagree. Also, we should protect against overwriting a previous yaml file

[olliesilvester]

Couple more comments, sorry. Also, CI is complaining about lines not being covered by tests

[olliesilvester]

We only need to create the panda device here

[rtuck99]

I was being lazy - we don't seem to have a nice function for creating only one named device, only one for creating everything. I will create one.

[olliesilvester]

This one spiralled a bit, sorry - looks good I think! Longer term it might be nice to have something similar to the dodal connect command, like dodal save_device args, but this is fine for now. Also, because we can't connect to PVA signals from the office network, this will only work on beamline machines.