New Textbox Component (#2718)

* Adding textbox with no props

* Fixing namings and adding shape style

* simplify usage

* Fix linting issues

* Re-name demo

* Use new shape authoring style

* Add tests

Simplify API

* Add better types for styles

* Add more options to TextBox and add documentation

---------

Co-authored-by: zohar11 <zohar@sumit-ai.com>
Co-authored-by: Dolan <dolan_miu@hotmail.com>

src/file/textbox/texbox-content/textbox-content.ts

@@ -0,0 +1,8 @@
+import { ParagraphChild } from "@file/paragraph";
+import { BuilderElement, XmlComponent } from "@file/xml-components";
+
+export const createTextboxContent = ({ children = [] }: { readonly children?: readonly ParagraphChild[] }): XmlComponent =>
+    new BuilderElement<{ readonly style?: string }>({
+        name: "w:txbxContent",
+        children: children as readonly XmlComponent[],
+    });