Add NeonClient2 package and update NeonClient import

neon_client2/exceptions.py

@@ -0,0 +1,13 @@
+from requests.exceptions import HTTPError
+
+
+class NeonClientException(HTTPError):
+    """Base exception class for all exceptions raised by the Neon Client."""
+
+    pass
+
+
+class NeonClientAuthenticationException(NeonClientException):
+    """Exception raised when authentication fails."""
+
+    pass