netipsec: add probe points for the ipsec/esp/ah/ipcomp counters

Extend what we did for netinet counters in 60d8dbbef075 (netinet: add a probe
point for IP, IP6, ICMP, ICMP6, UDP and TCP stats counters, 2024-01-18) to the
IPsec code.

Sponsored by: Rubicon Communications, LLC ("Netgate")
Differential Revision: https://reviews.freebsd.org/D46416