parsimonious: Update return types of NodeVisitor's methods

[Four-Velocity]

According to the parsimonious/nodes.pyi NodeVisitor.visit should return Any, while NodeVisitor.parse and NodeVisitor.match should return Node.

According to the code and docstrings of the parsimonious parse and match methods are just a shortcuts for the visit method:

SomeVisitor().parse('some_string') is a shortcut for
SomeVisitor().visit(some_grammar.parse('some_string')).

SomeVisitor().match('some_string') is a shortcut for
SomeVisitor().visit(some_grammar.match('some_string')).

So the return type of the parse and match should be the same as for the visit

[Four-Velocity]

Ok, perhaps I need some time or help to figure out how to specify it correctly 🙃

[Four-Velocity]

Hey @JelleZijlstra 👋
Looks like it's done

[github-actions]

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉