Diagnostics sensors for "free"

[dotdoom]

Checklist

• I have filled out the template to the best of my ability.
• This only contains 1 feature request (if you have multiple feature requests, open one feature request for each feature request).
• This issue is not a duplicate feature request of previous feature requests.

Is your feature request related to a problem? Please describe.

I'm migrating from a custom esphome component to using btproxy. My previous setup used to have plenty of diagnostic sensors which are read from Nuki lock. The readings are coming "for free" along with information already required for the integration to function correctly - they just wait there to be parsed and presented. Examples if them are: battery voltage, rotation degrees for latest lock, night mode, battery drain for latest lock action, RSSI, clock skew etc.

Describe the solution you'd like

It would be nice to keep the diagnostics, which I'd happily contribute to this project if @ronengr has interest in having them here!

Would probably be most sensible to have those diagnostic sensors disabled (or at least hidden) by default so they don't flood the dashboards.

Describe alternatives you've considered

• stay on esphome custom component, which seems like a waste of maintenance resource
• live without diagnostic sensors, which seems like a waste of useful debug information

Additional context

Sensors section

Diagnostic sensors section

[ronengr]

This is a great idea.
Fell free to open a PR.
If you need any help please let me know.