Is your feature request related to a problem? Please describe.
While creating CreateReadSessionRequest we are setting MaxStreamCount as 0 which as I understand will leave the decision on server to choose the correct stream count.
On my testing on various public and private data sources I always found the number of stream to be 1.
I would like to set PreferredMinStreamCount as readClientSettings.maxWorkerCount as hint to the server for desired minimum streams.

Describe the solution you'd like
I would like to set PreferredMinStreamCount as readClientSettings.maxWorkerCount as hint to the server for desired minimum streams.

Describe alternatives you've considered
Since there is no option in sdk that allow user to configure this there are no other alternatives.

Additional context
https://cloud.google.com/bigquery/docs/reference/storage/rpc/google.cloud.bigquery.storage.v1#createreadsessionrequest