openpgp: Add Cert::into_packets2, TSK::into_packets.

  - Cert::into_packet is problematic because it does not protect from
    accidentally leaking secret key material.  The documentation even
    warns about that, but it still happened.  Hence, this is a
    violation of our safe-by-default principle guiding the API, and we
    should fix it.

  - The replacement, Cert::into_packets2, strips secret key material
    just as serializing a cert does.  To convert to a sequence of
    packets while keeping the secret key material, a new function is
    added: TSK::into_packets, analogous to how TSK serializes secret
    key material.

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