Expands codegenDecl to work in function params. fixes #22306 (#22307)

* Expands codegenDecl to work in function params. fixes #22306

* makes the test more concrete so T{lit} params dont match

* adds sfCodegenDecl

tests/cpp/tcodegendecl.nim

@@ -0,0 +1,17 @@
+discard """
+  targets: "cpp"
+  cmd: "nim cpp $file"
+  output: "3"
+"""
+
+{.emit:"""/*TYPESECTION*/
+  int operate(int x, int y, int (*func)(const int&, const int&)){
+    return func(x, y);
+  };
+""".}
+
+proc operate(x, y: int32, fn: proc(x, y: int32 ): int32 {.cdecl.}): int32 {.importcpp:"$1(@)".}
+
+proc add(a {.codegenDecl:"const $#& $#".}, b {.codegenDecl:"const $# $#", byref.}: int32): int32  {.cdecl.} = a + b
+
+echo operate(1, 2, add)