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/commerce.config.json

@@ -0,0 +1,10 @@
+{
+  "provider": "ordercloud",
+  "features": {
+    "wishlist": false,
+    "cart": true,
+    "search": false,
+    "customerAuth": false,
+    "customCheckout": true
+  }
+}