dco_freebsd.c: add D_DCO_DEBUG messages for counters and notifications

dco_freebsd.c: add D_DCO_DEBUG messages for counters and notifications

Some of these debug messages only existed on Linux, and made debugging
DCO issues on FreeBSD more difficult.  Add them, using the same style as
used for dco_linux.c

While at it, change all format strings for "peerid" to "%u" (wherever
appropriate, dco->dco_message_peer_id is an "int" today and changing
this to uint32_t is out of scope for "make better logging")

Change-Id: Ife55cb78401dad921b75f6c86d9bd0642f6a6e83
Signed-off-by: Gert Doering <gert@greenie.muc.de>
Acked-by: Frank Lichtenheld <frank@lichtenheld.com>
Gerrit URL: https://gerrit.openvpn.net/c/openvpn/+/1349
Message-Id: <20251107165038.26171-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg34250.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>