trust: implement the "edk2-cacerts" extractor

Extract the DER-encoded X.509 certificates in the EFI_SIGNATURE_LIST
format that is

- defined by the UEFI 2.7 spec (using one inner EFI_SIGNATURE_DATA object
  per EFI_SIGNATURE_LIST, as specified for EFI_CERT_X509_GUID),

- and expected by edk2's HttpDxe when it configures the certificate list
  for HTTPS boot from EFI_TLS_CA_CERTIFICATE_VARIABLE (see the
  TlsConfigCertificate() function in "NetworkPkg/HttpDxe/HttpsSupport.c").

The intended command line is

  p11-kit extract \
    --format=edk2-cacerts \
    --filter=ca-anchors \
    --overwrite \
    --purpose=server-auth \
    $DEST/edk2/cacerts.bin

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1559580
Signed-off-by: Laszlo Ersek <lersek@redhat.com>

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