feature #6: Implement named parameters

src/test/resources/sql/function/Test/test_function_multiple.sql

@@ -0,0 +1,11 @@
+CREATE OR REPLACE FUNCTION test_function_multiple (name text default 'plop', IN hi text default 'hello', out result json)
+LANGUAGE plpgsql
+AS
+$$
+BEGIN
+    result = json_build_array(
+        json_build_object('id', 3, 'name', name),
+        json_build_object('id', 4, 'name', hi)
+    );
+END;
+$$