Allow ban messages to be hidden

[greeeen-dev]

Checklist

• [x] The same feedback was not posted yet.
• [x] This is not a suggestion for the moderation team.
• [x] All info applicable to the issue has been attached.

Is your feature request related to a problem? Please describe.

Currently the bot will send a notification in the channel that someone was banned from the chat. There should be an option to disable this.

Describe the solution you'd like

Add a --discreet flag or similar to allow the messages to be hidden.

Describe alternatives you've considered

Additional context

Release as part of v1.2.1