redact on ban

[dozro]

Describe the problem

option to set redact on kick, see https://github.com/matrix-org/matrix-spec-proposals/blob/travis/msc/user-redact/proposals/4293-redact-on-ban.md

Describe the solution you'd like

should be if i saw it wrong a simple added event flag and a corresponding checkbox

that the ban event looks like this after all

{
  // Irrelevant fields excluded

  "type": "m.room.member",
  "state_key": "@spam:example.org",
  "sender": "@mod:example.org",
  "content": {
    "membership": "ban",
    "reason": "flooding", // this is copied to `redacted_because`, leading to clients showing it
    "redact_events": true
  }
}

Alternatives considered

No response

Additional context

No response