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/auth/use-signup.tsx

@@ -0,0 +1,19 @@
+import { useCallback } from 'react'
+import useCustomer from '../customer/use-customer'
+import { MutationHook } from '@commerce/utils/types'
+import useSignup, { UseSignup } from '@commerce/auth/use-signup'
+
+export default useSignup as UseSignup<typeof handler>
+
+export const handler: MutationHook<any> = {
+  fetchOptions: {
+    query: '',
+  },
+  async fetcher() {
+    return null
+  },
+  useHook:
+    ({ fetch }) =>
+    () =>
+    () => {},
+}