Add typography and spacing to the Figma plugin

[vnys]

In order for the developers to find the correct spacing and typography tokens we need to add support for that in the Figma plugin. As it currently stands it only supports colours.

[vnys]

The plugin now shows spacing and typography in Figma using test data. Need to go trough all the spacing and typography variables and update the code syntax. Also some remaining Figma props that needs to be mapped to CSS properties.

[vnys]

I have sent a request to the Toolbox team to be added as admin to the plugin repo so I can push my changes.

[vnys]

https://github.com/equinor/design-system-figma-plugins