New node: Arc (#2470)

* init

* add closed and slice options

* Make it work beyond -360 to 360 degrees

* Switch "closed" and "slice" to ArcType enum

* Update default ranges

---------

Co-authored-by: Keavon Chambers <keavon@keavon.com>

libraries/bezier-rs/src/subpath/structs.rs

@@ -137,3 +137,10 @@ pub enum AppendType {
 	IgnoreStart,
 	SmoothJoin(f64),
 }
+
+#[derive(Copy, Clone, Eq, PartialEq, Hash)]
+pub enum ArcType {
+	Open,
+	Closed,
+	PieSlice,
+}