KCL: End-exclusive ranges like [0..<10] (#7179)

Closes https://github.com/KittyCAD/modeling-app/issues/6843

To clarify:
`[1..10]` is 1, 2, ..., 8, 9, 10
`[1..<10]` is 1, 2, ... 8, 9

rust/kcl-lib/src/parsing/token/tokeniser.rs

@@ -87,7 +87,7 @@ pub(super) fn token(i: &mut Input<'_>) -> PResult<Token> {
         '0'..='9' => number,
         ';' => semi_colon,
         ':' => alt((double_colon, colon)),
-        '.' => alt((number, double_period, period)),
+        '.' => alt((number, double_period_less_than, double_period, period)),
         '#' => hash,
         '$' => dollar,
         '!' => alt((operator, bang)),
@@ -320,6 +320,16 @@ fn double_period(i: &mut Input<'_>) -> PResult<Token> {
     ))
 }
 
+fn double_period_less_than(i: &mut Input<'_>) -> PResult<Token> {
+    let (value, range) = "..<".with_span().parse_next(i)?;
+    Ok(Token::from_range(
+        range,
+        i.state.module_id,
+        TokenType::DoublePeriodLessThan,
+        value.to_string(),
+    ))
+}
+
 /// Zero or more of either:
 /// 1. Any character except " or \
 /// 2. Any character preceded by \