fix(connection): support absolute download urls for public data

mdrsclient/connection.py

@@ -92,6 +92,8 @@ class MDRSConnection:
         self.__cache.laboratories = laboratories
 
     def __build_url(self, path: str) -> str:
+        if path.startswith("http://") or path.startswith("https://"):
+            return path
         if self.url == "":
             raise MissingConfigurationException("remote host is not configured")
         return f"{self.url}/{path}"