Rating component

[Carifio24]

This PR adds a "user experience rating" component for receiving user ratings, and in particular allows using the new endpoint defined in cosmicds/cds-api#203 to pass this information back to the database.

There are still some things to do here:
~~ Make the component, and in particular the faces, scale with screen size ~~

• Add a "peeking out" piece that the user can then click to open the full component

I'm wondering if the styling may need to be delegated to each particular story. I think we have reasonable defaults here, but it's hard to be able to anticipate every use case.

[Carifio24]

Things to update from team discussion:

• Make feedback submission two-stage - just faces first, then allow adding comments. Submit to database on any update with the faces.
• Make question modifiable via prop