Component Change Request: Add sizing and optional icons to CTA Link component

[stephaniehobson]

Please describe the change you wish to see

Add sizing to cta_link component

Please describe why these changes need to be made

We use different sizes on the Mozilla homepage.

Please provide any designs or prototypes of the proposed changes

Please describe where this component is currently in use

In use on both WMO and FXC.

Please describe what this component should do in the following conditions

Some Figma stuff. (Mozilla only)

Is the development of this component a blocking dependency for other work? Please explain if so

This is part of standardizing the updates from the Mozilla refresh.