add nunchaku to spy uplink (mini CQC) (#89817)

## About The Pull Request

Added a much faster and deadlier “version” of the telescopic baton, with
the ability to counterattack (stun) melee/throwable attacks, but
switching back after each one. The speed of stun and harm strikes are
identical to each other, allowing for combo attacks. The knockdown time
is significantly shorter to make battle more cinematic. Medium-high spy
bounty.


## Why It's Good For The Game

A In-hand and stylish replacement for the nukie CQC, allowing for
non-lethal combat, and crushing skull if need be.
stun/harm speed = 0.8 SECONDS (default value for any melee)
force = 16 (7 hit crit)
bare wound = 5
stamina damage = 30 (4 hit stamcrit)
knockdown time = 250 MILLISECONDS (+500 for up, but you may crawling and
pickup guns)
active throw mode = counterattack (stun) enemy

code/modules/uplink/uplink_items/spy_unique.dm

@@ -148,3 +148,10 @@
 	name = /datum/uplink_item/implants/nuclear/thermals::name
 	desc = /datum/uplink_item/implants/nuclear/thermals::desc
 	item = /obj/item/autosurgeon/syndicate/thermal_eyes/single_use
+
+/datum/uplink_item/spy_unique/nunchaku
+	name = "Syndie Fitness Nunchuks"
+	desc = "Heavyweight titanium nunchucks, quickly knocking opponents to the ground, then just as easily smashing the opponent afterward."
+	item = /obj/item/melee/baton/nunchaku
+	cost = SPY_UPPER_COST_THRESHOLD
+	uplink_item_flags = SYNDIE_ILLEGAL_TECH | SYNDIE_TRIPS_CONTRABAND