Use PHPStan to guide the developer

[CrochetFeve0251]

Is your feature request related to a problem? Please describe.
Currently we count on the developer for making the link with the documentation.
However, this makes it more complex for new Devs.

Describe the solution you'd like
We could create a new set of rules to guide the developer on his own code.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.