Allow @:using with Class and Enum

[Simn]

There might be corner cases I'm not thinking of.

Closes #10106

[Simn]

Notably, I consider #7453 resolved with this:

// MyMacroTools.hx
import haxe.macro.Expr;

class MyMacroTools {
	static public macro function getVersion(c:ExprOf<Class<Main>>) {
		return macro 1;
	}
}

// Main.hx
@:using(MyMacroTools)
class Main {
	static function main() {
		trace(Main.getVersion());
	}
}