Add flags for handling features of advanced logs

[sairon]

Add flags for features previously available only to host logs.

[mdegat01]

Need to add the completions as I suggested below.

Additionally I would strongly suggest refactoring this into two helpers: one for adding the flags and one for processing them. This same code is copied and pasted in 7 places it looks like, we should use common helpers instead.

[home-assistant]

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[sairon]

Thanks for the review, @mdegat01, it looks indeed better this way. There was some specific error handling implemented only for addons, not sure why. I have removed it, but if we want to keep it, I don't see a reason why only one of the endpoints should get special handling. Also added the completions, check the individual commits for less diff noise.

[mdegat01]

This looks good.

I guess my minor organization suggestion would be I think it makes more sense to have addLogsFlags and processLogsFlags in cmd/host.go rather then cmd/root.go. I would also probably put hostBootCompletions in there for good measure. But not necessary, it all works fine like this.