feat(data-table): allow custom column widths (#1265)

* feat(data-table): allow header column `width`, `minWidth` values

* Run "yarn build:docs"

* test(data-table): assert width, minWidth properties

* docs(data-table): add "Custom column widths" example

types/DataTable/Table.svelte.d.ts

@@ -32,6 +32,12 @@ export interface TableProps
    * @default false
    */
   stickyHeader?: boolean;
+
+  /**
+   * Set the style attribute on the `table` element
+   * @default undefined
+   */
+  tableStyle?: string;
 }
 
 export default class Table extends SvelteComponentTyped<