Text statistics. Extend statistics

[khashashin]

What type of request is this?

New feature for an existing tool

Clear and concise description of the feature you are proposing

The current state of the "Text Statistics" tool is great, but there is room for improvement. I propose adding a unique word counting feature to the "Text Statistics" tool. This enhancement will allow users to easily determine the number of unique words in a given text, which is valuable for various text analysis tasks.

Is their example of this tool in the wild?

A great example of a tool that includes unique word counting is the following website: Planetcalc - Unique Words Counter. I frequently use this site for that specific purpose and believe integrating similar functionality into our tool would be highly beneficial.

Additional context

No response

Validations

• [X] Check the feature is not already implemented in the project.
• [X] Check that there isn't already an issue that request the same feature to avoid creating a duplicate.
• [X] Check that the feature can be implemented in a client side only app (IT-Tools is client side only, no server).

[sharevb]

Hi @khashashin and @CorentinTh , implemented in #1010 (and more stats)