ENH: add some more error messages for motors

[ZLLentz]

Description

• Add error messages from issue texts
• Add a placeholder message for when we need to make fake testing errors

Motivation and Context

• closes Add error message for 17056 (0x42a0) #152
• closes Add error message for 17241 (0x4395) #199
• I accidentally made a fake error today that matched a real error code

How Has This Been Tested?

I did the "check all objects" syntax check, I didn't go back and try to cause these specific error flavors, nor did I think this required a unit test.

Where Has This Been Documented?

Just this PR for now, later in the release notes

Pre-merge checklist

• Code works interactively
• Test suite passes locally
• Code contains descriptive comments
• Libraries are set to Always Newest version (Library, *)
• Committed with pre-commit or ran pre-commit run --all-files