feat: manipulate design tokens from C#

[EisenbergEffect]

🙋 Feature Request

Design tokens are very powerful but it's hard to access the full features of the system today without writing JavaScript. We should look into a way to create a C# API that can set token values on arbitrary components.

🤔 Expected Behavior

I should be able to set any token to a value on any component.

😯 Current Behavior

Tokens can only be set through the design system provider.

💁 Possible Solution

We'll need to be able to get tokens by name globally most likely. Then we'll need some JS interop from the C# side to find the token and set the value, using some sort of element reference.