feat(studio): add download modelweights step before uploading chatbot to cloud

[laurentlp]

This PR adds the prerequisites steps to make sure that the models are uploaded with the chatbot when deploying to the cloud.

To test this feature, you have two options:

1. Use the cloud NLU
   • No configuration is required
   • It will succeed and you will be able to see the model(s) on the disk under data/<botId>/models/<modelId>
2. Run the NLU locally
   • Clone the NLU repository and checkout the cloud branch
   • Set CLOUD_NLU_ENDPOINT to http://localhost3200 on Botpress side
   • Create a configuration file for the NLU server by running yarn start init
   • Edit the nlu.config.json file by adding the config "modelTransferEnabled": true
   • Start the NLU server and try to deploy a bot. It will fail but you will be able to see the model(s) on the disk under data/<botId>/models/<modelId>

[linear[bot]]

DEV-2486 Add download modelweights step before uploading chatbot to cloud