KCL: change twist to a case of extrude (#7481)

@franknoirot @jtran and I decided that the `extrudeTwist()` function (which I added in https://github.com/KittyCAD/modeling-app/pull/7480) would be better as an optional case of the normal `extrude` function. Doing it this way means less work for the frontend team.

rust/kcl-lib/src/docs/mod.rs

@@ -283,6 +283,9 @@ mod tests {
   bidirectionalLength?: number(Length),
   tagStart?: TagDecl,
   tagEnd?: TagDecl,
+  twistAngle?: number(Angle),
+  twistAngleStep?: number(Angle),
+  twistCenter?: Point2d,
 ): [Solid; 1+]"#
         );
     }