Markdown Drawer - shared vue component

What does this MR do and why?

Meta component to help present rendered markdown documents in UI.

Issue: #329234 (closed)

2/4

• Update controller update to allow clean MD render (merged)
  • Markdown Drawer - shared Vue component (merged) 👈 this MR
    • Add more data to the search context
      • Add syntax options drawer to topBar component

Screenshots or screen recordings

How to set up and validate locally

1. checkout this branch
2. check component story in shared component storybook https://gitlab-org.gitlab.io/gitlab/storybook/?path=/story/markdown-drawer -->

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #329234 (closed)