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pf: Add counters for syncookies

Count when we send a syncookie, receive a valid syncookie or detect a
synflood.

Reviewed by:	kbowling
MFC after:	1 week
Sponsored by:	Modirum MDPay
Differential Revision:	https://reviews.freebsd.org/D31713

(cherry picked from commit 4cab80a8dfecdf16333a1113513e046b9f4dd7f6)

Git Hash:   253d1f4e316127def53919bbd65696123253483d
Git Author: kp@FreeBSD.org
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