Make Grants API available

This functionality was all implemented but not exposed on the Client object
and therefore there was no way to make API calls

nylas/client.py

@@ -2,6 +2,7 @@
 from nylas.handler.http_client import HttpClient
 from nylas.resources.applications import Applications
 from nylas.resources.auth import Auth
+from nylas.resources.grants import Grants
 from nylas.resources.calendars import Calendars
 from nylas.resources.events import Events
 from nylas.resources.webhooks import Webhooks
@@ -42,6 +43,16 @@ def auth(self) -> Auth:
         """
         return Auth(self.http_client)
 
+    @property
+    def grants(self) -> Grants:
+        """
+        Access the Grants API.
+
+        Returns:
+            The Grants API.
+        """
+        return Grants(self.http_client)
+
     @property
     def applications(self) -> Applications:
         """