Add msp category for cat toilets

[cperrin88]

Description

Added new device category msp for cat toilets.

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

I did limited local testing with a cat toilet (KatzenRobo). Unfortunately they only support only a few of the standard instructions but these work well.

• Local Testing

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[cperrin88]

I need help with the supported_devices_cn.md. I don't speak chinese.

[shihuimiao]

can you offer the Device diagnostic file, so i can test it.

[cperrin88]

Sure. Here it is:

smartlife-diagnostics.json

[cperrin88]

Do you need anything to merg this or is this dead?