slightly redoes how animals hunt for food (#87166)

## About The Pull Request
before, if u wanted to make ur animal hunt for food, u had to give them
the find food subtree, the attacking subtree, and had to edit their
targeting stratedgy to include items. this makes it so u only have to
give them just 1 subtree which will handle everything it needs to. also
makes it alot more customizable, u can now set a hunger cooldown for ur
animals, and cute emotes for them to play after eating food

## Why It's Good For The Game
makes it more convenient for future devs to include food hunting
behaviors to their animals, while also making it more customizable

## Changelog
🆑
code: animals' food hunting behavior has been refactored, please report
any bugs
/🆑

code/modules/mob/living/basic/vermin/lizard.dm

@@ -64,7 +64,7 @@
 
 /datum/ai_controller/basic_controller/lizard
 	blackboard = list(
-		BB_TARGETING_STRATEGY = /datum/targeting_strategy/basic/allow_items,
+		BB_TARGETING_STRATEGY = /datum/targeting_strategy/basic,
 	)
 
 	ai_traits = STOP_MOVING_WHEN_PULLED
@@ -72,7 +72,6 @@
 	idle_behavior = /datum/idle_behavior/idle_random_walk
 	planning_subtrees = list(
 		/datum/ai_planning_subtree/find_food,
-		/datum/ai_planning_subtree/basic_melee_attack_subtree,
 		/datum/ai_planning_subtree/random_speech/lizard,
 	)