Added state support to SetImageAsync

[esdg]

Regarding Stream Deck documentation (https://developer.elgato.com/documentation/stream-deck/sdk/events-sent/#setimage)

setImage have a 3rd parameter called state. This parameter let set the image for a specific state.

As this parameter is optional call with 2 paramater will not need to be updated.

Tested with and without 3rd parameter.