Add ability to make custom requests (#81)

* Add ability to make custom requests

When creating records using POST requests, the response is an empty 204. However, the link to the record is stored in the Location header of the response.

This is to allow me to access the headers of the response so I can get the resulting record IDs.

* style fix

* fix style

* Update zeep.py

netsuite/rest_api.py

@@ -28,6 +28,9 @@ def __init__(
     def hostname(self) -> str:
         return self._make_hostname()
 
+    async def request(self, method: str, subpath: str, **request_kw):
+        return await self._request_impl(method, subpath, **request_kw)
+
     async def get(self, subpath: str, **request_kw):
         return await self._request("GET", subpath, **request_kw)