Provide const assertion on tokens in TypeScript

[Peeja]

In the past, we've gotten a lot of value out of typing our token values as const. This means that in VS Code, for instance, the Intellisense will show you the values alongside the token names. Ideally, engineers never need to know the values when they're writing code, because they have the token name from the designer, but we've found that from time to time folks still have to look up a token by its value. We're using Figmagic to import our tokens into a shared library, and then using that library in multiple apps, so looking up a token name by value in the code means digging into the shared library's repo, while this change makes it possible in the editor where you're already working.

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[mikaelvesavuori]

Also: A very good addition! Thanks for contributing. Upon merging, I will add your name to the contributors list if you don't mind?

[Peeja]

Happy to be on the list, thanks!

[mikaelvesavuori]

Looks good! Merging. This is part of version 4.2.21. Thanks again for your time and contribution!

[sonarcloud[bot]]

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