#940 - Add positional tab feature

Also add extra run elements as per spec

src/file/paragraph/run/positional-tab.spec.ts

@@ -0,0 +1,27 @@
+import { expect } from "chai";
+
+import { Formatter } from "@export/formatter";
+
+import { PositionalTab, PositionalTabAlignment, PositionalTabLeader, PositionalTabRelativeTo } from "./positional-tab";
+
+describe("PositionalTab", () => {
+    it("should create a PositionalTab with correct root key", () => {
+        const tree = new Formatter().format(
+            new PositionalTab({
+                alignment: PositionalTabAlignment.CENTER,
+                relativeTo: PositionalTabRelativeTo.MARGIN,
+                leader: PositionalTabLeader.DOT,
+            }),
+        );
+
+        expect(tree).to.deep.equal({
+            "w:ptab": {
+                _attr: {
+                    "w:alignment": "center",
+                    "w:relativeTo": "margin",
+                    "w:leader": "dot",
+                },
+            },
+        });
+    });
+});