Remove RSocketInboundGateway since it isn't ready

spring-integration-rsocket/src/main/java/org/springframework/integration/rsocket/inbound/RSocketInboundGateway.java

@@ -1,55 +0,0 @@
-/*
- * Copyright 2019 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.springframework.integration.rsocket.inbound;
-
-import java.util.Arrays;
-
-import org.springframework.integration.gateway.MessagingGatewaySupport;
-import org.springframework.messaging.Message;
-import org.springframework.messaging.MessageDeliveryException;
-import org.springframework.messaging.ReactiveMessageHandler;
-import org.springframework.util.Assert;
-
-import reactor.core.publisher.Mono;
-
-/**
- *
- * @author Artem Bilan
- *
- * @since 5.2
- */
-public class RSocketInboundGateway extends MessagingGatewaySupport implements ReactiveMessageHandler {
-
-	private final String[] path;
-
-	public RSocketInboundGateway(String... path) {
-		Assert.notNull(path, "'path' must not be null");
-		this.path = path;
-	}
-
-
-	@Override
-	public Mono<Void> handleMessage(Message<?> message) {
-		if (!isRunning()) {
-			return Mono.error(new MessageDeliveryException(message,
-					"The RSocket Inbound Gateway '" + getComponentName() + "' is stopped; " +
-							"service for path " + Arrays.toString(this.path) + " is not available at the moment."));
-		}
-		return null;
-	}
-
-}