feat(button): add to prop type

The docs do show that the "to" prop is usable on the button, but the types don't support it, making it hard to use in types components.

https://primevue.org/button/#link

packages/primevue/src/button/Button.d.ts

@@ -207,6 +207,10 @@ export interface ButtonProps extends ButtonHTMLAttributes {
      * @defaultValue false
      */
     unstyled?: boolean;
+    /**
+     * Route Location the router-link should navigate to when clicked on.
+     */
+    to?: string
 }
 
 /**