Setup formatting and export some extra types to make import location consistent

[nfowl]

This PR contains 4 commits that are best reviewed as standalone.

• First commit:
  • Adds prettier config file as we use some non standard conventions that need to be defined.
  • Format almost all files (markdown was missed)
• Second commit:
  • exports a couple of types that weren't exported or made public
• Third commit:
  • Initial format ran using @canva/prettier. Have changed this to just use upstream version
• Fourth commit:
  • formats markdown