Implement wasp doctor command

[Martinsos]

@infomiho said:

it would check if they have Docker, Node.js installed, if something is running on PORT 3000 or 3001 or 5432 and stuff like that 😄

It might help with debugging. Or even if it runs at startup to make sure their setup is valid 🤷‍♂️
Flutter has something like that: https://www.codecademy.com/article/check-your-flutter-installation-with-flutter-doctor

We should consider maybe merging it with wasp status. But the idea is the same -> it would do some sanity checks, help you when figuring out what is wrong with your project.

I wonder if we really want to have special command for this though, why wouldn't these checks just be normal part of wasp workflow? Maybe run at the start of wasp start? But we can consider that on the go, as we figure out what the checks are and so on, we will get that clarity on the way.