Use S3 for chalice deploy to overcome slow upload timeouts

I sometimes am in a rural area where upload speeds are slow enough that chalice deploy times out and I cannot upload. Before using chalice, I got around this by uploading first to S3. Is there any option for doing that with chalice? Or if not, please consider this a feature request. The other nice thing S3 upload provides is a progress bar (a non-issue with fast upload speed, I know).

Start by tracing the chalice deploy upload path and its timeout behavior; the issue does not name specific files or tests. Compare the requested S3-first upload flow and progress reporting with the current deployment process. Done would mean slow uploads can complete through S3 without the existing timeout limitation, with progress visible to the user.

Written by the indexing model from the issue text.