stub out linked list view rule in new eval viz system; sketch out pointer graph cache layer, for pointer chasing & building graphs asynchronously, for use in the linked list viewer & other future visualizers

src/eval_visualization/eval_visualization_builtin_view_rules.c

@@ -287,6 +287,21 @@ EV_VIEW_RULE_EXPR_RESOLUTION_FUNCTION_DEF(array)
   return expr;
 }
 
+////////////////////////////////
+//~ rjf: "list"
+
+EV_VIEW_RULE_EXPR_EXPAND_INFO_FUNCTION_DEF(list)
+{
+  EV_ExpandInfo info = {0};
+  return info;
+}
+
+EV_VIEW_RULE_EXPR_EXPAND_RANGE_INFO_FUNCTION_DEF(list)
+{
+  EV_ExpandRangeInfo info = {0};
+  return info;
+}
+
 ////////////////////////////////
 //~ rjf: "slice"