feat: ✨ add single parsed parameter search

lib/comfpile/engines/parser_engine.rb

@@ -45,6 +45,10 @@ module Comfpile
             end
         end
 
+        def find_parsed_parameter(key)
+            find_parsed_parameters(key).last
+        end
+
         # Try to find a relative or absolute source file 
         # artefact.
         # Used to resolve the include, require and reference