update cloud credentials

A user should be able to call `cloud-profile update-credentials [cloud-profile-name]` to easily update the credentials used for the cloud profile. This calls the appropriate cloud provider APIs to refresh the set of credentials, and then send it to Deploifai API.

Start by locating the cloud-profile command entry point and how existing cloud provider calls and Deploifai API requests are organized. Trace the update-credentials flow and identify the supported providers and credential payloads. Done means the command refreshes credentials through the appropriate provider APIs and sends them to the Deploifai API.

Written by the indexing model from the issue text.