Fix query list encoding (#134)

Author: Chase Coalwell

smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/integration/HttpBindingProtocolGenerator.java

@@ -314,8 +314,13 @@ private boolean writeRequestQueryString(
                     Shape target = model.expectShape(binding.getMember().getTarget());
                     String queryValue = getInputValue(context, binding.getLocation(), "input." + memberName,
                             binding.getMember(), target);
-                    writer.write("query[__extendedEncodeURIComponent($S)] = __extendedEncodeURIComponent($L);",
-                            binding.getLocationName(), queryValue);
+                    if (target instanceof CollectionShape) {
+                        writer.write("query[__extendedEncodeURIComponent($S)] = $L.map(entry => "
+                                + "__extendedEncodeURIComponent(entry));", binding.getLocationName(), queryValue);
+                    } else {
+                        writer.write("query[__extendedEncodeURIComponent($S)] = __extendedEncodeURIComponent($L);",
+                                binding.getLocationName(), queryValue);
+                    }
                 });
             }
         }