Mail: variation for OcSelect

[kulmann]

Initial Checklist

• I understand this is a user story and questions should be posted in the Community Discussions
• I searched issues and couldn’t find anything (or linked relevant results below)

User Story

• As a user, I want to see a condensed email compose form so that it doesn't take too much space.

User Value

pretty user interface

Acceptance Criteria

• OcSelect component has a variation for an inline label
• Inline label looks like in the mockup (To, CC, BCC)
• with inline label enabled the OcSelect component is still accessible (a11y), i.e. there must be a dedicated "label" html tag associated with the form element.