Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Discussed in issue #5509 and Design Node #88

closes #5509

Proposed changes

Improve editor loading speeds by reducing vendors budle size and loading code editors async.

Please refer to Design Node #88 for finer detail

TLDR

• Remove ACE from vendors bundle
  • add vendor/ace/ace-bootstrap.js to load it only when set in settings.js
• Load monaco (and ace) async (by adding script element to DOM in the bootstrap)
  • This removes document.write violations
• Adds a basic (textarea) code editor as a fallback for late loading of editor (and usable alternative code editor for mad people)

Checklist

• I have read the contribution guidelines
• For non-bugfix PRs, I have discussed this change on the forum/slack team.
• I have run npm run test to verify the unit tests pass
• I have added suitable unit tests to cover the new/changed functionality