ENH: Add MSTA Bits

[slactjohnson]

Description

Adds in an EPICS signal to bring the the motor MSTA bits. This signal is used to create a dictionary of interpreted values, as well as a "homed" property.

Motivation and Context

I would like to implement some automated homing on some finicky motor stacks. I need a way to check that the homing routine has completed.

How Has This Been Tested?

Tested live on one of the stages of interest (a SmarAct linear stage).

Where Has This Been Documented?

This PR.

Screenshots:

Live session (standard motor record):

IMS Motor:

Newport Motor:

Pre-merge checklist

• [x] Code works interactively
• [x] Code contains descriptive docstrings, including context and API
• [x] New/changed functions and methods are covered in the test suite where possible
• [x] Test suite passes locally
• [x] Test suite passes on GitHub Actions
• [x] Ran docs/pre-release-notes.sh and created a pre-release documentation page
• [x] Pre-release docs include context, functional descriptions, and contributors as appropriate

[slactjohnson]

@silkenelson I've now set up separate enums and decoding for the IMS and Newport motors. It appears to work as expected (see the images in the PR description).

-Unfortunately, I wasn't able to find a Newport or IMS motor that was reporting an actual error code. Is there anything you can think of that would force an error code on one of these stages? EDIT: Scratch that, I found an IMS motor with an error.

Is there anything else you would like to see in terms of verifying functionality?

[ZLLentz]

Is there anything else you would like to see in terms of verifying functionality?

I think the screenshots in your description are sufficient for functionality

I'm somewhat curious about the other various motor types in the tree and if they build off of the standard MSTA or off of one more like IMS/Newport. I'm eternally frustrated by these "special" record types, this seems to bite us surprisingly frequently.

[ZLLentz]

I'm going to click "Update branch" so hopefully it's ready to merge when we look again tomorrow

[ZLLentz]

CI failed on some network issue- ran again before I sign off

[slactjohnson]

Going to wait on merging for a little bit for @silkenelson to comment on the implementation or any other tests that should be done.

[slactjohnson]

I'm going to go ahead and merge this because some of my current work is waiting on this update. We can revise later if needed.