types/views: add SliceMapKey[T]

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views.Slice are meant to be immutable, and if used as such it
is at times desirable to use them as a key in a map. For non-viewed
slices it was kinda doable by creating a custom key struct but views.Slice
didn't allow for the same so add a method to create that struct here.

Updates tailscale/corp#17122

Signed-off-by: Maisem Ali <maisem@tailscale.com>

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