[Feature/Enhancement] Update CLI installation command. Install feature enhancement

[LorenzoTettamanti]

Is your feature request related to a problem?

• No

  Problem Description:

  The installation from the CLI doesn't have any subcommands to install further components or future examples, and only relies on one cfcli install command

  Solution:

  Divide the install command cfcli install into two subcommands :

  • cfcli install cortexflow: this command is responsible for installing all the cortexbrain components
  • cfcli install _examples_: this command is responsible for installing examples in the cluster