BigQuery Storage Write client cannot be given a request timeout

[fornwall]

Write::builder() exposes no way to set request timeouts, and there is no per-request way either, so an AppendRows call that stalls without failing stalls the caller until it cancels.

[dbolduc]

Thanks for the feature request. I will make sure this gets done as part of #6355

[dbolduc]

I sent #6844 to support timeouts for default streams and #6852 to make the settings configurable by the application.

@fornwall - Do you need this feature for non-default streams?

I don't think ordered retries for non-default streams will make it into the next release (scheduled for ~2026-09-23)