Add diameter arg to arc and tangentialArc (#7247)

Both these functions previously took a `radius`. If you previously used
the radius arg, you can keep using it, or you can use `diameter` instead.

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

@@ -1048,7 +1048,7 @@ mod tests {
         let snippet = arc_fn.to_autocomplete_snippet().unwrap();
         assert_eq!(
             snippet,
-            r#"arc(${0:%}, angleStart = ${1:3.14}, angleEnd = ${2:3.14}, radius = ${3:3.14})"#
+            r#"arc(${0:%}, angleStart = ${1:3.14}, angleEnd = ${2:3.14}, diameter = ${3:3.14})"#
         );
     }