Feature/math improve (#2976)

* add new feature

* add test file

* update test file

* update test file

* Fix linting

---------

Co-authored-by: Dolan Miu <dolan_miu@hotmail.com>

src/file/paragraph/math/bar/math-bar-properties.ts

@@ -0,0 +1,11 @@
+// https://www.datypic.com/sc/ooxml/e-m_barPr-1.html
+import { XmlComponent } from "@file/xml-components";
+
+import { MathBarPos } from "./math-bar-pos";
+
+export class MathBarProperties extends XmlComponent {
+    public constructor(type: string) {
+        super("m:barPr");
+        this.root.push(new MathBarPos({ val: type }));
+    }
+}