How to visit any node in the validator?

[trusktr]

For example something like

	const checks: ValidationChecks<MyLangAstType> = {
		<what-goes-here>: checkAnyNode,
	}

Similarly is there separate builtin API to visit all AST nodes? Or do we implement a custom traverser ourselves?

Just trying to get ideas based on what is possible.

[msujew]

I've created #983 to track this. I believe this would make sense as a general validator feature, but as of now, you would need to override the DefaultDocumentValidator#validateAst method.