CLI: Improving the UX (plugins, command name aliases)

As the number of commands in the CLI grows it's getting hard to remember / type the exact command that we wish to execute. I ran into this issue multiple times when testing the CLI. Obviously we can use --help flag to find the exact name of the command, but this is quite suboptimal, especially when the help output becomes very long (see: working-groups)

There are a few things we can do to address this, ie. adding a few oclif plugins (https://oclif.io/docs/plugins) seems like a very high-value low-effort solution:

• add @oclif/plugin-autocomplete (bash autocomplete)
• add @oclif/plugin-not-found (did you mean... message in case of typo)
• create a few aliases for command names (which are very easy to add), ie.: startReviewPeriod + beginReviewPeriod
• optionally add @oclif/plugin-warn-if-update-available (not strictly related to this issue, but seems like a good plugin to have too)

┆Issue is synchronized with this Asana task by Unito