MongoDB shell doesn't create a session implicitly

Hello,

MongoDB Drivers, for example Python, creates a session when a command is executed. There is no need to create it explicitly.

MongoDB Shell works different from all the drivers. When commands are executed without a explicit session, the shell won't create one.

MongoDB Shell should follow drivers specification to avoid misunderstandings and mistakes.

https://github.com/mongodb/specifications/blob/master/source/sessions/driver-sessions.rst

Regards.