Hide signature help inside callbacks

[RblSb]

Solution for HaxeFoundation/haxe#11794, idk if it's better on ide level.

Example for testing:

class Main {
	static function main() {
		foo(0, (name, age) -> {});

		foo(0, (name, age) -> {
			final f = (a, b, c) -> {}
			f(1, 2, 3);
		});
	}

	/** Foo **/
	static function foo(
		a:Int,
		?cb:(name:String, age:Int) -> Void,
		?b:Int,
		?c:Int,
	):Void {}
}

[AlexHaxe]

thanks!