remove raw_sql and pandas (#902)

This is technically a breaking change since we remove the endpoint for
`raw_sql`. `raw_sql` was an undocumented internal tool so we should
discuss how we want to handle this.

clients/python/pyproject.toml

@@ -15,7 +15,6 @@ classifiers = [
     "Operating System :: OS Independent",
 ]
 dependencies = [
-  'pandas >= 1.3',
   'requests >= 2.28',
   'pydantic >= 1.9',
   'numpy >= 1.21.6',