More plugin Shapes (#3497)

* ✨ Allows more Plugin shapes

* ♻️ Refactors for speed

and power

* Restrict plugin syntax to only single callback or array of callbacks

---------

Co-authored-by: Caleb Porzio <calebporzio@gmail.com>

packages/alpinejs/src/plugin.js

@@ -1,5 +1,7 @@
-import Alpine from './alpine'
+import Alpine from "./alpine";
 
 export function plugin(callback) {
-    callback(Alpine)
+    let callbacks = Array.isArray(callback) ? callback : [callback]
+
+    callbacks.forEach(i => i(Alpine))
 }