Add HEALTHCHECK support

[lmagyar]

Proposed Changes

If Tailscale is offline longer then a configurable timeout, add-on will be restarted.

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.

By default it won't treat offline status (.Self.Online == false) unhealthy, only Stopped BackendState (I was able to put TS into Stopped state only manually, but maybe this can be helpful once, at least won't harm).

When the network is totally down and timeout is set, add-on will be restarted once, then until it is connected again, it won't be restarted regularly.

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