Code completions for @settings (#5622)

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

rust/kcl-lib/src/execution/annotations.rs

@@ -24,6 +24,10 @@ pub(super) const IMPORT_COORDS_VALUES: [(&str, &System); 3] =
     [("zoo", KITTYCAD), ("opengl", OPENGL), ("vulkan", VULKAN)];
 pub(super) const IMPORT_LENGTH_UNIT: &str = "lengthUnit";
 
+pub(crate) fn settings_completion_text() -> String {
+    format!("@{SETTINGS}({SETTINGS_UNIT_LENGTH} = mm, {SETTINGS_UNIT_ANGLE} = deg)")
+}
+
 pub(super) fn is_significant(attr: &&Node<Annotation>) -> bool {
     match attr.name() {
         Some(name) => SIGNIFICANT_ATTRS.contains(&name),