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/std/array.kcl

@@ -133,7 +133,7 @@ export fn reduce(
   initial: any,
   /// Run once per item in the input `array`. This function takes an item from the array, and the previous output from `f` (or `initial` on the very first run). The final time `f` is run, its output is returned as the final output from `reduce`.
   f: fn(any, accum: any): any,
-): [any] {}
+): any {}
 
 /// Append an element to the end of an array.
 ///

rust/kcl-lib/std/math.kcl

@@ -448,7 +448,7 @@ export fn legLen(
   hypotenuse: number(Length),
   /// The length of one of the triangle's legs (i.e. non-hypotenuse side).
   leg: number(Length),
-): number(deg) {}
+): number(Length) {}
 
 /// Compute the angle of the given leg for x.
 ///

rust/kcl-lib/std/sketch.kcl

@@ -277,4 +277,4 @@ export fn revolve(
   tagStart?: tag,
   /// A named tag for the face at the end of the revolve.
   tagEnd?: tag,
-): Solid {}
+): [Solid; 1+] {}