[feat] Create <rh-account-dropdown> component

[zhawkins]

Description

When rh-nav comes out, unfortunately, we'll need rh-account-dropdown to go along with it.

Code for existing component based on PFE v1: https://gitlab.cee.redhat.com/customer-platform/cp-elements/-/tree/main/elements/rh-account-dropdown

Currently being used on:

• https://www.redhat.com/en
• https://access.redhat.com/en
• https://developers.redhat.com

Acceptance Criteria

• Design done
• Development done

Images

No response

Design file

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Other resources

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[zeroedin]

I've talked to @heyMP on this a bit. I feel like this is a microcosm of the myrh project. I think we can combine efforts there and create an authenticated experience while abstracting the parts that are purely design system and what is a function of myrh.

I'm working on the basic functionality of rh-navigation-primary as we speak so as I get some demos in place we can start looking at how we can use parts of myrh to accomplish this.

[bennypowers]

are there ui elements used in the original cp-elements feature which are missing from rhds? can we open issues for those, then move this issue to it's forever home?