feat: allow collapsible to be individually expanded

A collapsible can now be individually expanded, independent of its containing accordion.

packages/components/src/components/accordion/accordion.tsx

@@ -66,7 +66,7 @@ export class Accordion {
     /**
      * Handle `expanded`
      */
-    if (!this.dependent) {
+    if (this.expanded && !this.dependent) {
       this.getCollapsibleChildren().forEach((child) => {
         child.expanded = this.expanded;
       });