Is your feature request related to a problem? Please describe.
Currently result.raise_for_status() raises the error but I would like to deal with status codes later on rather than to get an exception from the client. The issue is described here: graphql-python/gql#40

Describe the solution you'd like
Add a flag, raise_for_status=True/False in client.execute().

Describe alternatives you've considered
Comment out the result.raise_for_status() line

Additional context