Update entities.py

Fields support.
https://v3-apidocs.cloudfoundry.org/version/3.197.0/index.html#fields
As specified in the API description. Navigable object would contain only data from includes returned by fields query params.

Author: krismarc

cloudfoundry_client/v3/entities.py

@@ -300,6 +300,9 @@ def _append_encoded_parameter(parameters: List[str], args: Tuple[str, Any]) -> L
             parameter_name, parameter_value = args[0], args[1]
             if isinstance(parameter_value, (list, tuple)):
                 parameters.append("%s=%s" % (parameter_name, quote(",".join(parameter_value))))
+            elif isinstance(parameter_value, (dict)) and parameter_name == "fields":
+                for resource, key in parameter_value.items():
+                    parameters.append("%s[%s]=%s" % (parameter_name, resource, quote(",".join(key))))
             else:
                 parameters.append("%s=%s" % (parameter_name, quote(str(parameter_value))))
             return parameters