Instance control CLI

Goal

Create console application to control Database Lab instance with REST API, like kubectl or gcloud.

TODO / How to implement

• Single CLI can control multiple Database Lab instances
• Verification tokens can be at config files and environment variables.
• Create an API SDK.
• Ability to list snapshots
• Ability to fetch instance status
• Ability to create, stop, reset, list clones

Extra issues

• Add changes to the docs repository(docs!12 (closed))
• Parse API error responses
• Add an option to ignore a self-signed certificate error
• Ability to update clones
• Fix initialization without existing config

Acceptance criteria