Add HEALTHCHECK support

[lmagyar]

Proposed Changes

This PR treats the following situations unhealthy:

• always: .BackendState == "Stopped"
• optionally: if once was online but gets offline for more then healthcheck_offline_timeout seconds
• optionally: if never gets online for more then healthcheck_restart_timeout seconds

In my case a plain WAN switch-over to backup WAN on the router was able to permanently make Tailscale offline. And it's not only me: tailscale/tailscale#12021 It seems to be an issue when TS is in a container. And similar bugs can happen in the future.

And after testing it in real life circumstances, TS was able to not go online even after a restart, if the transient in the WAN state was long enough. But after (re)start, we should restart the add-on again much slower, eg. to give time to authenticate on the very first time.

Note: I was able to put TS into Stopped state only manually, but maybe this can be helpful once, at least won't harm.

Note: This schema (below) would look nicer, but until a bug in the Supervisor/UI is not fixed (see #2640), we can't do this.

healthcheck:
  offline_timeout: int?
  restart_timeout: int(900,)?

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