BSK-1005 Added ButtonGroup, DropdownMenu and DropdownMenuItem

[dancork]

What does this PR do? (please provide any background)

The apps consuming

What tests does this PR have?

How can this be tested?

What domains are affected?

Any tech debt?

Screenshots / Screencast

What gif best describes how you feel about this work?

![]()

• [ ] I have checked our general contributing document and the project specific contributing document (if present) and I'm happy for this to be reviewed.

---

Notes

When reviewing Static Site Generator projects, please think carefully about what can be done to centralise common functionality. Please also pay attention to anything configurable that will also need updating in the Yeoman generator template

---

Reviewer

• [ ] :+1:
• [ ] I don't think this PR needs any additional reviewers

By adding a +1 you are confirming you have...

• Witnessed the work behaving as expected (this could be on the author's machine or screencast).
• Checked for coding anti-patterns.
• Checked for appropriate test coverage.
• Checked all the tests are passing.

---