transitions token support

[pacxiu]

Hey,

do you have in plans to support transitions tokens such as other base one?

For now if I've some repeating transition eg. 0.3s ease-in-out and want to use that outside of theme file in sx prop I've to add it as string rather than transition: 'standard' token one. Are there maybe some ways to overcome this that I might have missed?

[lachlanjc]

We can close now that it’s merged @hasparus!