Requesting permission for ability to display RP icon, human readable RP name or human readable IDP name

[tttzach]

w3c-fedid/FedCM#287 was filed to determine if we could support more use cases by providing UI customizations. We have resolved some of the use cases listed as examples there with the RP context API w3c-fedid/FedCM#470 and we are actively exploring the remaining today with the button mode API.

• Ability to display an <RP icon>.
• Ability to display a <Human readable RP name> and/or <Human readable IDP name>.

If anyone feels like this would be useful for them, or if there are any strings/UI changes we could make to support your use case, please let us know.