Should we use happi for device loading?

[canismarko]

Should look into happi for loading the devices. Apparently it can work from a YAML file so should be adaptable to a TOML file. If it works better than what we have now, consider switching. It should be fast, though, since it effects the loading time for Firefly.

[canismarko]

Things to consider

• ophyd-async support
• connecting to devices
• seeing failures at startup
• mocking/sim
• toml support
• factories
• type checking
• find devices by label
• skip existing motors