Feature Request: Add missing metadata fields.

[mxtommy]

Hi! Been a while :-)

Trying out this code: https://github.com/JohnySeven/WaveshareESP32-S3-Relay-SK and I see the data but it's missing "supportsPut": true in the metadata. Current SKMetadata class doesn't support it.

KIP at least uses this to filter paths that you can select for usage with a switch.

Looking at doc seems there's a couple others missing as well: https://demo.signalk.org/documentation/_signalk/server-api/MetaValue.html

displayScale
example
supportsPuts
zones

If you can't get around to it I can maybe try and do it myself in a few weeks, just been a few years since I've done any C coding... I'm more than a bit rusty 😅

Thanks!