Add maxNoOfCchars / maxNoOfWords property

Could we add a feature such that would allow us to put a maximum number of characters/ words that the user can enter in the editor? Such that when the user reaches that, he will not be able to type in it again.
Preferably also adding the ability to call a callback for that event.

The issue names no files, tests, or entry points. Start by reviewing the editor's public configuration and input handling to determine where character and word limits belong. Done should include both limits, prevention of further input at the limit, and a callback for reaching it.

Written by the indexing model from the issue text.