Add the abillity to automatically set the pl of discord-puppets

[JokerGermany]

I want to make a Discord "Server" read only (despite for me), would be nice if you could e.g. set the pl of discord puppets to 1 and then set the reactions/write message pl to 1.

Alternative:

23

[Zwelf]

This would be especially useful for bridging announcement channels. All the messages sent by puppets should get through, but the matrix users shouldn't be able to write messages in the room.