Rename identifier to data or params

[allaire]

Hi @danielrhodes,

I think it would be clearer to rename identifier to params or perhaps data in the create method (create(channel, identifier:, autoSubscribe:, bufferActions:). I see that the underlying API send identifier to the backend, but since name is a standalone parameter, I think it would make sense to abstract it a little bit more.

[allaire]

I can tackle this if you want, I suppose I should create a new method and add a deprecation warning on the other? Let me know!