Add Iterable toList() method

Author: bentsherman

src/main/java/nextflow/script/types/shim/Iterable.java

@@ -138,6 +138,11 @@ Transforms each element in the iterable with the given closure and returns the s
     """)
     <R> R sum(Function<E,R> transform);
 
+    @Description("""
+        Converts the iterable to a list.
+    """)
+    List<E> toList();
+
     @Description("""
         Converts the iterable to a set. Duplicate elements are excluded.
     """)