Allow setting device name to custom string

[boltgolt]

When iSponsorBlockTV connects to the app the tv displays a notification that a "new device has joined", this PR makes the name that shows in that notification configurable. This is helpful for setting a more friendly name, especially handy if you have people on the network that do not know what "iSponsorBlockTV" means

[dmunozv04]

This is a good PR, but the use of device_name as a parameter could be confusing to users.

[boltgolt]

Good point, what about join_name or self_description