feat: add .is on components (#68)

Author: Kai

src/Component.ts

@@ -89,6 +89,15 @@ export class Component<T extends HTMLElement = HTMLElement> extends ElementCompo
         return new Component<T>(element);
     }
 
+    /**
+     * Test whether the element would be selected by the specified
+     * {@link https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_selectors CSS selector}, or group of CSS selectors.
+     * @param selectors
+     */
+    public is(selectors: string): boolean {
+        return this.node.matches(selectors);
+    }
+
     /**
      * Set style property
      * @param name Property name