Type check and coerce arguments to user functions and return values from std Rust functions (#6958)

* Shuffle around function call code

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Refactor function calls to share more code

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Hack to leave the result of revolve as a singleton rather than array

Signed-off-by: Nick Cameron <nrc@ncameron.org>

---------

Signed-off-by: Nick Cameron <nrc@ncameron.org>

rust/kcl-lib/src/std/array.rs

@@ -1,12 +1,9 @@
 use indexmap::IndexMap;
 
-use super::{
-    args::{Arg, KwArgs},
-    Args,
-};
 use crate::{
     errors::{KclError, KclErrorDetails},
     execution::{
+        fn_call::{Arg, Args, KwArgs},
         kcl_value::{FunctionSource, KclValue},
         types::RuntimeType,
         ExecState,