Is your feature request related to a problem? Please describe.
When deploying firebase functions to new projects, I have to manually edit the functions via the GCP web console in order to set timeouts, enable retries, etc., for different functions. It's easy to make a mistake when doing this and, after deploying functions for the first time, there is a period during which they are live with the wrong config (i.e. the wrong timeout or retry config) because I can't configure the functions in the GCP UI until the deployment is complete.

Describe the solution you'd like
I would like to be able to set function timeouts, enable retries (failurePolicy), etc., via the firebase-functions FunctionBuilder API, in the same way I can set the region.

Describe alternatives you've considered
I've looked at updating my functions via a bash script and the gcloud command line tool, but this really belongs with the rest of the non-environment-specific functions config (e.g. regions) in my source code.

Edit: It's actually possible to set function timeouts via FunctionBuilder.runWith(), so this issue only applies to retries (failurePolicy).