Feature Request: gcsfuse rate limiting on GCS Batch Mounts

[jacksonwb]

I would like to request that the Batch API expose gcsfuse rate limit flags for GCS buckets mounted on tasks.

https://cloud.google.com/storage/docs/gcsfuse-performance-and-best-practices#rate_limiting

This would enable jobs to be mounted with some safety limits on how many queries can be made to GCS. Due to the implementation of gcsfuse simple file operations can create a large number of GCS Class A operations.

https://github.com/GoogleCloudPlatform/gcsfuse/issues/853

Currently a large job can very easily accidentally emit a huge number expensive operations against GCS.