Feature/kappa npc

[RovxBot]

This pull request introduces a new custom NPC, Kappa, who is designed as the Guild Leader of Maxiboomers and spawns in Orgrimmar. The SQL script safely adds all necessary data for the NPC, including appearance, equipment, dialogue, and spawn location, and ensures idempotency by cleaning up any previous instances before insertion.

Custom NPC creation:

• Adds a new NPC entry for Kappa (creature_template) with a unique display as an Orc female warrior, appropriate faction, and random movement AI.
• Sets up Kappa's equipment to visually wield Thunderfury and the off-hand Warglaive of Azzinoth (creature_equip_template).

Appearance and dialogue:

• Configures the NPC's display model to use the Kor'kron General look (creature_template_model).
• Adds a custom gossip menu and NPC text for player interaction (gossip_menu, npc_text).

Spawn and cleanup logic:

• Inserts spawn data to place Kappa in the Orgrimmar bank area with random roaming behavior (creature).
• Ensures safe re-runs by deleting any previous data related to Kappa before re-inserting.