cmd/tailscale/cli: migrate hidden debug subcommand to use subcomands

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It was a mess of flags. Use subcommands under "debug" instead.

And document loudly that it's not a stable interface.

Change-Id: Idcc58f6a6cff51f72cb5565aa977ac0cc30c3a03
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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