- add support for device dehydration v2 i.e. `org.matrix.msc3814`
- implement rest client methods and models
- implement flows for creating and storing the dehydrated device pickle in in 4s as well as recovering it to use for device rehydration
- implement methods for creating, retrieving, deleting dehydrated devices as well as consuming the messages stored on the backend in between sessions
- delete previous implementation

…ode the deviceId when requesting dehydrated device events