Improve the editing of large content in Live Data cells

Editing the content of a cell when the content is large, or if the edit field is a rich editor, can lead to a bad user experience because the content is displayed in a cell.

For instance:

Proposed solutions:

• replace the large field with a more adapted field type (e.g., XWIKI-8589)
• provide a rich edit with a small toolbox, to make it fit smaller spaces
• propose a button to open the edit field in a larger modal screen