Add cloud image & python-env support

[DerekMelchin]

We should be able to pass an option to the lean cloud backtest and lean cloud live commands. For example:

lean cloud backtest <project> [options] --python-venv <value>

[Martin-Molinero]

• Add new

  • lean project-update "My project" --image --python-env --parameter --description --name
  • lean cloud project-update "My project" --image --python-env --parameter --description --name
  • add lean update-project "My project" passthrough

• Remove image and python-env from live/backtest/research

[Martin-Molinero]

UPDATE: We will not create the project-update commands. Instead we once the API can support it we will allow specifying the image & python env per live/backtest/research deployments like we do locally