[7.x] Publish the form request stub used by RequestMakeCommand

[hailwood]

With V7 we got the awesome stubs:publish command which covers a lot of things.

One thing it doesn't cover is the default FormRequest, which is something I feel would be quite a good stub for things if you create your own base FormRequest class with custom methods and you want all the created form requests to extend your new base class.

This PR simply updates the RequestMakeCommand to function the same as the generators that have their stubs published.

[taylorotwell]

That's not the only changes that need to be made. The DummyClass and DummyNamespace need to be updated to reflect the other published stub variables for consistency.

[rcerljenko]

can you also do it for the observer stub?

[hailwood]

@taylorotwell done 👍

@rcerljenko I looked into it, however the observers have several other placeholders that get replaced, and as they're not part of the default replacements done via the GeneratorCommand I'd have to name them, and I don't want this PR to get rejected due to names in the observer stub.

It's pretty simple to do though, Check out the files changed in this PR, and how the JobMakeCommand functions with the boolean and then you can base your own PR around that for the observer stub and have the discussion there about what best to name the replacements 🙂