New module names (#3645)

* New naming convention using webflux and webmvc

The new suffixes are gateway-server-web{flux|mvc} and gateway-proxyexchange-web{flux|mvc}.

This commit updates the starters to use gateway-server-web{flux|mvc} suffixes.

* Adds new spring-cloud-gateway-server-web{flux|mvc} modules.

These simply depend on the old ones. A warning is logged if not using the new module.

* Adds s-c-g-proxyexchange-{webflux|webmvc} modules

* Updates docs for  s-c-g-{proxyexchange|server}-{webflux|webmvc} modules

Author: spencergibb

docs/modules/ROOT/nav.adoc

@@ -143,11 +143,23 @@
 
 	<modules>
 		<module>spring-cloud-gateway-dependencies</module>
+		<!-- Deprecated -->
 		<module>spring-cloud-gateway-mvc</module>
+		<!-- Deprecated -->
 		<module>spring-cloud-gateway-webflux</module>
+		<!-- Deprecated -->
 		<module>spring-cloud-gateway-server</module>
+		<!-- Deprecated -->
 		<module>spring-cloud-gateway-server-mvc</module>
+		<module>spring-cloud-gateway-proxyexchange-webflux</module>
+		<module>spring-cloud-gateway-proxyexchange-webmvc</module>
+		<module>spring-cloud-gateway-server-webflux</module>
+		<module>spring-cloud-gateway-server-webmvc</module>
+		<module>spring-cloud-starter-gateway-server-webflux</module>
+		<module>spring-cloud-starter-gateway-server-webmvc</module>
+		<!-- Deprecated -->
 		<module>spring-cloud-starter-gateway</module>
+		<!-- Deprecated -->
 		<module>spring-cloud-starter-gateway-mvc</module>
 		<module>spring-cloud-gateway-sample</module>
 		<module>spring-cloud-gateway-integration-tests</module>