Add new tokens to theme package

[tw15egan]

The first step to closing #8149 is to add the new tokens to the theme packages.

Until we create an alpha branch, we will add the new tokens to the theme package as references to the current tokens. That way, components can be updated to use the new tokens, but the old tokens will still be available.

For instance:

// current token references IDL color
export const interactive01 = blue60;

// new token, references old token until we create an alpha branch
export const backgroundBrand = interactive01;

Once we have an alpha branch, we can remove the old tokens, and have them reference the IDL colors directly

export const backgroundBrand = blue60;