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/customer/use-customer.tsx

@@ -0,0 +1,15 @@
+import { SWRHook } from '@commerce/utils/types'
+import useCustomer, { UseCustomer } from '@commerce/customer/use-customer'
+
+export default useCustomer as UseCustomer<typeof handler>
+export const handler: SWRHook<any> = {
+  fetchOptions: {
+    query: '',
+  },
+  async fetcher({ input, options, fetch }) {},
+  useHook: () => () => {
+    return async function addItem() {
+      return {}
+    }
+  },
+}