Polish RSocket server support

Relax the `NettyRSocketBootstrap` contract to allow all types of
`SocketAcceptor` implementations.

See gh-16021

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/rsocket/RSocketServerAutoConfiguration.java

@@ -20,6 +20,7 @@ import java.util.stream.Collectors;
 
 import io.netty.buffer.PooledByteBufAllocator;
 import io.rsocket.RSocketFactory;
+import io.rsocket.SocketAcceptor;
 
 import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
@@ -106,9 +107,8 @@ public class RSocketServerAutoConfiguration {
 		@Bean
 		public NettyRSocketBootstrap nettyRSocketBootstrap(
 				RSocketServerFactory rSocketServerFactory,
-				MessageHandlerAcceptor messageHandlerAcceptor) {
-			return new NettyRSocketBootstrap(rSocketServerFactory,
-					messageHandlerAcceptor);
+				SocketAcceptor socketAcceptor) {
+			return new NettyRSocketBootstrap(rSocketServerFactory, socketAcceptor);
 		}
 
 	}

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/rsocket/netty/NettyRSocketBootstrap.java

@@ -16,13 +16,14 @@
 
 package org.springframework.boot.rsocket.netty;
 
+import io.rsocket.SocketAcceptor;
+
 import org.springframework.boot.rsocket.context.RSocketServerInitializedEvent;
 import org.springframework.boot.rsocket.server.RSocketServer;
 import org.springframework.boot.rsocket.server.RSocketServerFactory;
 import org.springframework.context.ApplicationEventPublisher;
 import org.springframework.context.ApplicationEventPublisherAware;
 import org.springframework.context.SmartLifecycle;
-import org.springframework.messaging.rsocket.MessageHandlerAcceptor;
 
 /**
  * Bootstrap an {@link RSocketServer} and start it with the application context.
@@ -38,8 +39,8 @@ public class NettyRSocketBootstrap
 	private ApplicationEventPublisher applicationEventPublisher;
 
 	public NettyRSocketBootstrap(RSocketServerFactory serverFactoryProvider,
-			MessageHandlerAcceptor messageHandlerAcceptorProvider) {
-		this.rSocketServer = serverFactoryProvider.create(messageHandlerAcceptorProvider);
+			SocketAcceptor socketAcceptor) {
+		this.rSocketServer = serverFactoryProvider.create(socketAcceptor);
 	}
 
 	@Override