Move to a new way of bundling requirements

feature: commented sockets5 proxy setup for imap

feature: proxy setup for imap access in hugging face.

bugfix: smtp port for email access.

feature(#194): update response data format with lower case...

feature(#194): create folder for saving attach file and delete it after sending email...

feature(#98): updated send email api

feature(#98): add comment

feature(#98): changed env variables with constants.

feature(#98): updated requirements text and gmail manager