Register the number of keystrokes and mouse clicks

I propose to flesh out the not-afk feature with more details (i.e. add two new columns to register the real number of keystrokes and mouse cllicks).

This feature is insipired by reading the post of Stephen Wolfram

Firstly, it is always better to have more details, because these details may be forever lost if not to be recorded.

Secondly, we might have more insights or discoveries about our activites (writing, coding, gaming, etc.) based on these information.