follow-up: add requestWithRetries.ts to fernignore (#10)

* Added polling client for use with async and sync methods alike

* prettified polling client and added final response error check

* rename gooey client and export

* add headers from parent call

* update fernignore

* added requestWithRetries path to fernignore

.fernignore

@@ -1,3 +1,4 @@
 # Specify files that shouldn't be modified by Fern
 src/GooeyClient.ts
-src/index.ts
+src/index.ts
+src/core/fetcher/requestWithRetries.ts