Adding a rerank API to the AIMon SDK. (#54)

* Adding a rerank API. Synchronized with Stainless repo.

* Updating notebooks and added new retrieval notebook examples

---------

Co-authored-by: Preetam Joshi <info@aimon.ai>

Author: pjoshi30

aimon/__init__.py

@@ -1,5 +1,7 @@
+# File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
+
 from . import types
-from ._types import NOT_GIVEN, NoneType, NotGiven, Transport, ProxiesTypes
+from ._types import NOT_GIVEN, Omit, NoneType, NotGiven, Transport, ProxiesTypes
 from ._utils import file_from_path
 from ._client import Client, Stream, Timeout, Transport, AsyncClient, AsyncStream, RequestOptions
 from ._models import BaseModel
@@ -34,6 +36,7 @@
     "ProxiesTypes",
     "NotGiven",
     "NOT_GIVEN",
+    "Omit",
     "ClientError",
     "APIError",
     "APIStatusError",