Add support for server-side events and tests

User can POST to web endpoint in SSE style, i.e:

HTTP/1.1
Content-Type: text/event-stream

data:foo

data:bar

Will be converted to a Flux with values foo and bar

spring-cloud-function-deployer/pom.xml

@@ -30,6 +30,11 @@
 			<artifactId>spring-cloud-function-web</artifactId>
 			<version>${project.version}</version>
 		</dependency>
+		<dependency>
+			<groupId>org.springframework.cloud</groupId>
+			<artifactId>spring-cloud-function-stream</artifactId>
+			<version>${project.version}</version>
+		</dependency>
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-configuration-processor</artifactId>