#2090 field description

fix #2090 (closed)

What is in this MR

• ability to add a description to a field
• show description as rich text format tooltip (will be handled in a separate task: #2632)
• show description as a tooltip in grid and form views near field name
• delayed tooltip hiding
  • only one tooltip visible at one time
  • clicking outside will close the tooltip
  • large content should be scrollable

How to test this MR

• create a field and add a description - an i icon should be visible in field name
• edit existing field and add a description - an i icon should be visible in field name
• remove existing description - i icon should disappear, 'add description' should be visible at the bottom of modal

• description can be in rich text format (stored internally as markdown):

• description field should be expandable vertically
• description tooltip should be expendable vertically

Merge Request Checklist

• A changelog entry has been created if required.
• New/updated Premium/Enterprise features are separated correctly in the premium or enterprise folder
• The latest Chrome and Firefox have been used to test any new frontend features
• Documentation has been updated
• Quality Standards are met
• Performance: tables are still fast with 100k+ rows, 100+ field tables
• The redoc API pages have been updated for any REST API changes
• Our custom API docs are updated for changes to endpoints accessed via api tokens
• The UI/UX has been updated following UI Style Guide