[Task] Add --version switch

[atextor]

Is your task related to a problem? Please describe.
Before the refactoring of the bamm-cli (#100), bamm-cli used to print information about its build date, however, this was removed. In order for a user to know whether they are are running the version they expect, there should be a --version switch on the CLI.

Describe the solution you'd like
There should be --version switch that prints out the version, build date and ideally git commit the version was built from.