add basic create command

[maltee1]

There are still a few problems. I'm not sure if they are caused by or just triggered by my changes

1. If I invite a ghost before running create, I will get a message that I already have a private chat with the user and the ghost leaves the room. I'm not sure how this is handled on the telegram bridge. IMHO, automatic dm creation should be limited to matrix rooms marked as direct. Inviting ghosts to rooms marked as rooms may trigger group creation in the future.
2. if I invite a ghost when there are already users in the room, the ghost joins directly. Once I run create, that ghost leaves the room.
3. I haven't been able to figure out where to obtain the matrix room's avatar url, so for now the room is created without an avatar.

member_role is currently set to DEFAULT. I suppose there isn't really a need to expose ADMINISTRATOR as an option. It's possibly somewhat related to a trusted private chat, but according to my understanding, the latter makes everyone who may join that room in the future automatically admin and the former only does that for the initial members. It's probably best to just map the power levels from the matrix side to signal

edit:
2 has changed with the fix for the invite implementation. The ghost still joins immediately but is no longer kicked. It also isn't added to the group upon group creation.

[maltee1]

OK, now it works

1. shouldn't have anything to do with the implementation of the command
2. works
3. still doesn't work, but can be added later imho.

[maltee1]

Setting avatar now works. I suppose the create command is complete.

resolved