Table Designer - Save Changes feature and Editor related features (#17335)

* table designer add/remove row support

* save changes and editor support

* address comments

* fix build error

* including missing change

* lower case request name

src/sql/base/browser/ui/table/table.ts

@@ -426,4 +426,8 @@ export class Table<T extends Slick.SlickData> extends Widget implements IDisposa
 	public set ariaLabel(value: string) {
 		this._tableContainer.setAttribute('aria-label', value);
 	}
+
+	public get container(): HTMLElement {
+		return this._tableContainer;
+	}
 }