add type info for compiled functions

spring-cloud-function-core/src/main/java/org/springframework/cloud/function/support/ConsumerProxy.java

@@ -30,4 +30,6 @@ public interface ConsumerProxy<T> extends Consumer<T> {
 	}
 
 	Consumer<T> getTarget();
+
+	String getInputType();
 }

spring-cloud-function-core/src/main/java/org/springframework/cloud/function/support/FunctionProxy.java

@@ -31,4 +31,8 @@ public interface FunctionProxy<T, R> extends Function<T, R> {
 	}
 
 	Function<T, R> getTarget();
+
+	String getInputType();
+
+	String getOutputType();
 }

spring-cloud-function-core/src/main/java/org/springframework/cloud/function/support/SupplierProxy.java

@@ -30,4 +30,6 @@ public interface SupplierProxy<T> extends Supplier<T> {
 	}
 
 	Supplier<T> getTarget();
+
+	String getOutputType();
 }