[WEB-1201] dev: dropdowns (#4721)

* chore: lodash package added

* chore: dropdown key down hook added

* dev: dropdown component

* chore: build error and code refactor

* chore: readme file updated

packages/ui/src/dropdown/common/loader.tsx

@@ -0,0 +1,9 @@
+import React from "react";
+
+export const DropdownOptionsLoader = () => (
+  <div className="flex flex-col gap-1 animate-pulse">
+    {Array.from({ length: 6 }, (_, i) => (
+      <div key={i} className="flex h-[1.925rem] w-full rounded px-1 py-1.5 bg-custom-background-90" />
+    ))}
+  </div>
+);