Add a timeout option to the CLI deploy command

[a-kinz]

Hi,
we want to deploy a rather big app to our RStudio Connect server, which always runs into this hardcoded timeout:
https://github.com/rstudio/rsconnect-python/blob/9fb791de0e79397007d58f954150c623a64b47e7/rsconnect/api.py#L288
We can successfully deploy the app by manually increasing the timeout, but it would be awesome if we could configure it with a parameter, for example like this:
rsconnect deploy manifest ./manifest.json -n server --timeout 1200

[tdstein]

Replaced by #346