Add back spring-cloud-function-web (faster startup)

With this change there are now 2 choices for web endpoints. The
stream servlet binder is useful for multi-binder use cases
(e.g. HTTP -> message broker).

pom.xml

@@ -56,6 +56,7 @@
 		<module>spring-cloud-function-context</module>
 		<module>spring-cloud-function-stream</module>
 		<module>spring-cloud-function-task</module>
+		<module>spring-cloud-function-web</module>
 		<module>spring-cloud-function-samples</module>
 		<module>spring-cloud-function-deployer</module>
 		<module>spring-cloud-function-adapters</module>