feat(admin, admin-ui, medusa-js, medusa-react, medusa): Support Admin Extensions (#4761)

Co-authored-by: Rares Stefan <948623+StephixOne@users.noreply.github.com>
Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>

packages/admin-ui/src/node/actions/clean.ts

@@ -0,0 +1,18 @@
+import fse from "fs-extra"
+import path from "node:path"
+
+type CleanArgs = {
+  appDir: string
+  outDir: string
+}
+
+/**
+ * Cleans the build directory and cache directory.
+ */
+export async function clean({ appDir, outDir }: CleanArgs) {
+  const cacheDir = path.resolve(appDir, ".cache", "admin")
+  const buildDir = path.resolve(appDir, outDir)
+
+  await fse.remove(buildDir)
+  await fse.remove(cacheDir)
+}