types/mapx, ipn/ipnext: add ordered map, akin to set.Slice

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We had an ordered set type (set.Slice) already but we occasionally want
to do the same thing with a map, preserving the order things were added,
so add that too, as mapsx.OrderedMap[K, V], and then use in ipnext.

Updates #12614

Change-Id: I85e6f5e11035571a28316441075e952aef9a0863
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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