Add target_type for target furthest enemy in spell casting AI

[balakethelock]

🍰 Pullrequest

• Added new target_type to target the furthest enemy within spell range for Creature_Spells table ai
• Implemented that new targetting type for the naxxramas mobs "Necro Stalker" and "Venom Stalker"

Proof

• Ability timers of the mobs are based on sniffs
  

• Replay to show targetting behavior

2023-12-15.18-07-06.mp4

Issues

• None

How2Test

• Log into game with a number of characters
• .npc summon 16453 (in the open world works)
• Tank it in melee with a character, two characters stand in range and move around to see it consistently targets the furthest one within LOS and spell range (in the case of poison charge, 40 yards)

Todo / Checklist

• Find out if the charge minimal range is 5 yard or 8 yards or something else. Needs data on both the naxxramas spiders and lava surgers from molten core
• If found that they stop charging at 8 yards instead of 5 yards, need to implement a targetParam for changing minimum range to search for targets. EDIT: Solved with Condition