Improve .github folder

[javidsegura]

Objectives:

1. Create an issues template (.github/ISSUE_TEMPLATE/*)
   • Rationale: standarize communication, reduce organizational overhead
2. Create a "on workflow_dispatch" CI with testing

• Rationale: currently only CI goes for pushes on main or its PR. Testing in Github's runner insteaed of locally is meaningful for certain context such as not being able to run radical flow becuase of being in a MacOS. This would be meaningful assuming you dont use a VM/docker.

3. Integrate linting into the CI pipeline in order to standarize the code styling
4. Add test coverage to githubs' artifacts

[AymenFJA]

I will pause on this as we will switch to pyproject.toml and tox.ini so we will upgrade everything soon. I will keep this open as it is a valid ticket.