Add FunctionFactoryMetadata interface for type discovery

The compiled functions implement that interface which means you can inspect
the signature of the method that created them and discover its
generic types.

scripts/registerConsumer.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-while getopts ":n:f:" opt; do
+while getopts ":n:f:t:" opt; do
   case $opt in
     n)
       NAME=$OPTARG
@@ -8,7 +8,10 @@ while getopts ":n:f:" opt; do
     f)
       FUNC=$OPTARG
       ;;
+    t)
+      TYPE=$OPTARG
+      ;;
     esac
 done
 
-curl -X POST -H "Content-Type: text/plain" -d $FUNC localhost:8080/consumer/$NAME
+curl -X POST -H "Content-Type: text/plain" -d $FUNC localhost:8080/consumer/$NAME?type=$TYPE