BREAKING: Change tangential arc to keyword args (#6266)

* Change tangentialArc, tangentialArcTo, and tangentialArcToRelative to keyword args

* Change tangentialArc offset to angle and convert to kw arg calls

* Fix lints

* Fix sketch errors and all unit tests passing

* Fix tangentialArcTo calls in KCL samples

* Update tangentialArc in samples

* Update sim test output

* Fix formatting

* Fix mistake in merge

* Fix gear rack sample

* Update output after more samples fixes

* Update gear rack output

* Add end label to docs snippet

* Fix to not add endAbsolute for an arc with radius or angle arguments

* Update docs outputs

* Fix formatting

* Fix executor tests

* Fix formatting

* Fix bench input files

* Fix spelling

* Improve error messages

---------

Co-authored-by: Adam Chalmers <adam.chalmers@zoo.dev>

rust/kcl-lib/src/std/args.rs

@@ -151,6 +151,10 @@ impl Args {
         let Some(arg) = self.kw_args.labeled.get(label) else {
             return Ok(None);
         };
+        if let KclValue::KclNone { .. } = arg.value {
+            // It is set, but it's an optional parameter that wasn't provided.
+            return Ok(None);
+        }
 
         T::from_kcl_val(&arg.value).map(Some).ok_or_else(|| {
             KclError::Type(KclErrorDetails {