(cpp) Add support for cpp (based on c)

lua/neogen.lua

@@ -129,6 +129,7 @@ neogen.setup = function(opts)
             javascript = require("neogen.configurations.javascript"),
             typescript = require("neogen.configurations.typescript"),
             c = require("neogen.configurations.c"),
+            cpp = require("neogen.configurations.c"),
             go = require("neogen.configurations.go"),
             java = require("neogen.configurations.java")
         },

lua/neogen/configurations/c.lua

@@ -9,6 +9,14 @@ local c_params = {
                 { retrieve = "first", recursive = true, node_type = "identifier", extract = true },
             },
         },
+        -- This one is only used in cpp, considering moving it elsewhere to refactor
+        {
+            retrieve = "all",
+            node_type = "variadic_parameter_declaration",
+            subtree = {
+                { retrieve = "first", recursive = true, node_type = "identifier", extract = true },
+            },
+        },
     },
 }
 local c_function_extractor = function(node)