Enable HTTP compression Reactor ClientHttpConnector

`ReactorClientHttpConnector` provides an adapter layer to `WebClient`
for using Reactor-Netty's `HttpClient`.
This commit enables HTTP compression support by default for this client
Connector.

Another constructor is still available for providing a custom
`HttpOptions` configuration.

Issue: SPR-15908

Author: bclozel

spring-web/src/main/java/org/springframework/http/client/reactive/ReactorClientHttpConnector.java

@@ -48,11 +48,13 @@ public class ReactorClientHttpConnector implements ClientHttpConnector {
 
 
 	/**
-	 * Create a Reactor Netty {@link ClientHttpConnector} with default {@link ClientOptions}
-	 * and SSL support enabled.
+	 * Create a Reactor Netty {@link ClientHttpConnector}
+	 * with default {@link ClientOptions} and HTTP compression support enabled.
 	 */
 	public ReactorClientHttpConnector() {
-		this.httpClient = HttpClient.create();
+		this.httpClient = HttpClient.builder()
+				.options(options -> options.compression(true))
+				.build();
 	}
 
 	/**