Add bandit security check CI/CD job

[VigneshVSV]

Bandit is a tool that analyses code for security flaws in python. We should note down if we override any vulnerabilities (meaning, those that pretend to be vulnerabilites, not real ones) and let the users know:

• what was overriden
• why
• where

Ideally, this should be an empty list, but I guess it will not be.

Steps to integrate:

• create a CI/CD job that will include bandit. Edit pyproject.toml to exclude all files and folders except the source folder. let the job be allowed to fail now, in case there are security issues at the time of working on this. The success requirement of this job per merge request can be enforced in a follow up ticket.
• add a markdown file security.md (and a subsection - bandit) that will include the security flaws reported. A table with file name, security flaw seen, why it was overcome, a custom numerical ID or serial number for the flaw (so that it can be recognised by ID instead of line number) should be mentioned
• bandit job should precede test job, add it in a stage called security
• add bandit to dev dependency