Use enum sensor device class in Z-Wave

[raman325]

Proposed change

If I understand the ENUM device class properly, we should be using it whenever there is a finite list of possible states. This PR correctly handles those use cases.

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• This PR fixes or closes issue: fixes #
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[raman325]

the coverage difference is misleading because I just rewrote some code to reduce lines but those lines were already not covered

[MartinHjelmare]

Thanks!

[MartinHjelmare]

What's the code coverage?

[raman325]

of the 7 lines missing from patch coverage in this PR, 3 already existed but were flagged because I rewrote the code to reduce some lines. For the four I added, these are all guard statements that we shouldn't hit in a normal scenario. I do wish there was a way to validate whether these guards are actually needed but unfortunately we don't know what we don't know in terms of the devices that are out there