[java][jvm] varargs of extern libs not parsed correctly

[RealyUniqueName]

Varargs parsed as java.NativeArray<T>, while it should be haxe.extern.Rest<T>
E.g. java signature of java.nio.file.Paths.get is public static Path get(String first, String... more)
But using it from Haxe as a method with rest arguments fails:

class Main {
	static function main() {
		java.nio.file.Paths.get('.');
	}
}

error:

$ haxe build.hxml 
src/Main.hx:3: characters 3-31 : Could not find a suitable overload, reasons follow
src/Main.hx:3: characters 3-31 : Overload resolution failed for (param1 : java.net.URI) -> java.nio.file.Path
src/Main.hx:3: characters 28-29 : String should be java.net.URI
src/Main.hx:3: characters 28-29 : For function argument 'param1'
src/Main.hx:3: characters 3-31 : Overload resolution failed for (param1 : String, param2 : java.NativeArray<String>) -> java.nio.file.Path
src/Main.hx:3: characters 3-31 : Not enough arguments, expected param2:java.NativeArray<String>
src/Main.hx:3: characters 3-31 : End of overload failure reasons

[RealyUniqueName]

While working on a fix I suddenly understood there's currently no way to pass a native array of values if that was parsed as haxe.extern.Rest.
So, #9274 should be addressed first.