chore: freeze python dependencies

[gruyaume]

Description

Here we freeze Python dependencies using pip-tool's pip-compile command and add the necessary .in requirements files. We also replace renovate with dependabot because of its support for maintaining pip-compile generated files.

Adding/Removing Python dependencies

If we need to add/remove dependencies, we should make those changes in the .in file, then manually run the pip-compile command, and finally create a PR with the change. The .txt files should not be modified manually.

Example:

pip-compile requirements.in > requirements.txt

Notes

• Once this PR is merged, we should close the Renovate GitHub issue: Dependency Dashboard #6
• A similar PR will be created in all of the Telco projects

Reference

• pip-compile support in dependabot

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that validate the behaviour of the software
• I validated that new and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have bumped the version of the library