[feat] support `--format` in request parameter

**Is your feature request related to a problem? Please describe.**

I'm always frustrated in any of API request parater, such as `ListRegionsRequest`, we only have property `filter` than what did support in `gloud`
https://cloud.google.com/sdk/gcloud/reference/topic/projections

CLI gcloud can use `--format` to implement projections on output transforming
**Describe the solution you'd like**
I hope in gcp-node we can have similar way to specify --format
**Describe alternatives you've considered**
Although we can always manipulate the output ultimtely by ourself, as sdk user, but it smells bad that google cloud offer different capability based on sdk language.