Add resize to document field

[Achisingh]

This pull request changes the document field editor’s default overflow behaviour to align with Keystone's other multi-line text field display mode in the Item view – supporting a fixed height and resizable container instead of an unbounded height for the field.

Justification:

Prior to this PR, the user would be burdened with having to view the entire contents of any document field instance in the item view. The existing approach:

• made it hard for users to discern where the form ends and the input begins (e.g. document field values can be styled to look like a field's label)
• forced the user into a lot of scrolling when:
  • there was a lot of content in the field
  • and/or when there were multiple document field instances within the form

This PR changes that behaviour to contain the input contents in a fixed height container with a border that demarcates the input area from the form container.

The user has two progressive disclosure options to view more:

• [NEW] Click and drag the resize handle to see more contents within the form
• [EXISTING] Click the "Expand" button located on the right side of the control bar to edit the field in full-screen mode

A video of the new behaviour

Screen.Recording.2022-07-26.at.10.42.19.am.mov

[raveling]

Looks great thank you!