Shelly Server implementation

[Jan200101]

Since this is a client library having an implementation of the server would be useful for both testing as well as setting up custom devices.

[h3tz]

Don't get it why a server would be helpful (except testing)

[Jan200101]

Don't get it why a server would be helpful (except testing)

Shelly devices are relatively dumb, so it might be possible to pretend to be one by doing the right things like making mDNS announcements with a specific name or hosting a specific endpoint that is used to query basic device information (e.g. Device Generation)