Add composer scripts

[WendellAdriel]

This PR adds some composer scripts to make it easier for the contributors to remember how to run the needed commands for testing.

[SimonFrings]

@WendellAdriel Thanks for contributing to Framework X 👍

This is generally a good idea to make the use of different commands easier and I see the value behind this, but I'm not sure if Framework X is the right project for this. We have many many Open Source libraries (similar to this one) and we try to create a consistent usage across all of them, so accepting this here would also open up the question if we should apply the same changes to our other projects. For some this even might be more work and I don't think there's much gained tbh.

This is more of a way to execute commands (tests, running server, etc.) differently and I don't really feel it's "better" than before. Don't get me wrong, the overall idea is good (we do the same with Makefiles), but in my opinion better suited for applications instead of libraries.

Nonetheless, thanks for bringing in your idea, keep em coming 💪