Add nan_count in Describe Functions with all conditions, made all request.
Hey, 
I am Aditya tomar from India.
I found an issue #54076. 
I added nan_count in describe function for dataframe, series and timestamps.

Kindly request to you please check it out.
for your feedback 

Mail : adityatomarsvnit@gmail.com

Thanks for the pull request, but it appears to have gone stale. If interested in continuing, please merge in the main branch, address any review comments and/or failing tests, and we can reopen.