Add ordercloud provider (#500)

* Add ordercloud provider

* Fix provider errors

* Make submit checkout optional

* Make submit checkout optional

* Remove nullables when creating endpoint type

* Update readme

* Log checkout error

* Log error

* Save token to cookie

* Update fetch rest

* Use token at checkout

Co-authored-by: Luis Alvarez <luis@vercel.com>

framework/ordercloud/fetcher.ts

@@ -0,0 +1,17 @@
+import { Fetcher } from '@commerce/utils/types'
+
+const clientFetcher: Fetcher = async ({ method, url, body }) => {
+  const response = await fetch(url!, {
+    method,
+    body: body ? JSON.stringify(body) : undefined,
+    headers: {
+      'Content-Type': 'application/json',
+    },
+  })
+    .then((response) => response.json())
+    .then((response) => response.data)
+
+  return response
+}
+
+export default clientFetcher