Adds hydroponics shrubs, allowing botanists to grow hedges. (#55496)

Replaces one of the rainbow seeds in the exotic seeds crate with a pack of shrub seeds.
Adds a new, growable seed species for shrubs. Shrubs, when planted (similar to kudzu!) plants a solid, weak barrier in hedges.
These hedges block vision, unless trimmed. Thankfully, we already have a hedge trimming skillchip, so using a sharp implement on the hedge will make it non-opaque.

code/modules/cargo/packs.dm

@@ -1700,7 +1700,7 @@
 					/obj/item/seeds/bamboo,
 					/obj/item/seeds/eggplant/eggy,
 					/obj/item/seeds/rainbow_bunch,
-					/obj/item/seeds/rainbow_bunch,
+					/obj/item/seeds/shrub,
 					/obj/item/seeds/random,
 					/obj/item/seeds/random)
 	crate_name = "exotic seeds crate"

code/modules/hydroponics/grown/misc.dm

@@ -261,3 +261,35 @@
 /obj/item/food/grown/aloe/microwave_act(obj/machinery/microwave/M)
 	new /obj/item/stack/medical/aloe(drop_location(), 2)
 	qdel(src)
+
+/obj/item/seeds/shrub
+	name = "pack of shrub seeds"
+	desc = "These seeds grow into hedge shrubs."
+	icon_state = "seed-shrub"
+	species = "shrub"
+	plantname = "Shrubbery"
+	product = /obj/item/grown/shrub
+	lifespan = 40
+	endurance = 30
+	maturation = 4
+	production = 6
+	yield = 2
+	instability = 10
+	growthstages = 3
+	reagents_add = list()
+
+/obj/item/grown/shrub
+	seed = /obj/item/seeds/shrub
+	name = "shrub"
+	desc = "A shrubbery, it looks nice and it was only a few credits too. Plant it on the ground to grow a hedge, shrubbing skills not required."
+	icon_state = "shrub"
+
+/obj/item/grown/shrub/attack_self(mob/user)
+	var/turf/player_turf = get_turf(user)
+	if(player_turf?.is_blocked_turf(TRUE))
+		return FALSE
+	user.visible_message("<span class='danger'>[user] begins to plant \the [src]...</span>")
+	if(do_after(user, 8 SECONDS, target = user.drop_location(), progress = TRUE))
+		new /obj/structure/fluff/hedge/opaque(user.drop_location())
+		to_chat(user, "<span class='notice'>You plant \the [src].</span>")
+		qdel(src)