build and then deploy with: sam deploy -b

### Describe your idea/feature/enhancement

I wish SAM could: be run with `sam deploy -b [...]` so that it can `build` and then immediately deploy once successful.

### Proposal

add an option to the `sam deploy` command which allows `sam` to `build` before deploying. This could be `-b` which is currently unused.

### Additional Details

I often need to run `sam build && sam deploy` and this could be made simpler by `sam deploy -b` which does a build then deploy.