[fix] text-transform CSS from Figma TextCase

[andrewmilligan]

The styleProps generator was converting Figma's TextCase values to CSS by lowercasing values other than ORIGINAL, resulting in invalid CSS values for text-transform like upper (rather than uppercase). This fixes that conversion by adding a utility function to properly map TextCase values to CSS values.

Find a simple reproduction here. This is a proposed fix for #113

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[andrewmilligan]

I wrote this up as I was investigating what was causing #113 so I figured I would just put it in and if it's helpful, great! I'm happy to make any tweaks you'd like or for you to take it over and do what you will with it. Hope this isn't an annoyance to you all. Love the plugin — we're in the process of trying to adopt it more systematically on my team ❤️

[sawyerclick]

I'm glad to hear its getting use, and thanks for the contribution! I'll check this PR out in the coming days.