[CLI]: Add a context command to switch between environment

[LorenzoTettamanti]

Is your feature request related to a problem?

• Yes

  Problem Description:

  The CLI relies on a Configmap to store the blocklist, also the command line primarly calls the connect_to_client function (see essentials.rs)

  Solution:

  Add a new command called set-context. The command will be used to change the context from kubernetes and Docker as follows:

  • cfcli set-context kubernetes (also k8s can be supported)
  • cfcli set-context docker

  Additional info

  no additional info

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