feat(cursor): Derive multiple traits for "SetCursorStyle"

[linrongbin16]

This PR derives multiple useful traits for SetCursorStyle enum:

I checked other enums in crossterm, and seems they all have these traits. So I think it's ok to also add to SetCursorStyle.

It also adds 1 unit test to make sure they're working.

[joshka]

I'm curious what use case there would be for ordering these? I can understand hashing them to store in some lookup table perhaps, but I can't think up a way that ordering them would be useful.

[linrongbin16]

I'm curious what use case there would be for ordering these? I can understand hashing them to store in some lookup table perhaps, but I can't think up a way that ordering them would be useful.

I simply read other enums in this repo, and found most of them derives the PartialOrd and Ord. So I also add them.

But you're right, after a second thought, the PartialOrd and Ord don't have any meaning here.

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Update: I removed the PartialOrd and Ord from SetCursorStyle derives. @joshka please take a look.

[joshka]

LGTM other than the comment about removing the tests.

[linrongbin16]

LGTM other than the comment about removing the tests.

Update: accepted the suggestion.