Inspect FunctionType to extract collection item type

Resurrects some code from #222 (the test didn't go far enough
when that issue was closed).

spring-cloud-function-web/pom.xml

@@ -60,6 +60,11 @@
 			<artifactId>spring-boot-configuration-processor</artifactId>
 			<optional>true</optional>
 		</dependency>
+		<dependency>
+			<groupId>org.synchronoss.cloud</groupId>
+			<artifactId>nio-multipart-parser</artifactId>
+			<scope>test</scope>
+		</dependency>
 	</dependencies>
 
 	<build>