Feat(LuaEngine/SpellHooks): Add support for RegisterSpellEvent with initial events

[iThorgrim]

This pull request integrates the RegisterSpellEvent system from the TrinityCore version of Eluna into AzerothCore, allowing scripts to handle specific spell-related events.

Supported Events

1. SPELL_EVENT_ON_PREPARE
   Triggered when a spell is prepared.
   Signature: (event, caster, spell)

2. SPELL_EVENT_ON_CAST
   Triggered when a spell is cast.
   Signature: (event, caster, spell, skipCheck)

3. SPELL_EVENT_ON_CAST_CANCEL
   Triggered when a spell cast is canceled.
   Signature: (event, caster, spell, bySelf)

Example Usage

lcoal SPELL_EVENT_ON_PREPARE = 1

local function OnSpellPrepare(event, caster, spell)
    print("RegisterSpellEvent :: OnPrepare")
end

RegisterSpellEvent(133, SPELL_EVENT_ON_PREPARE, OnSpellPrepare)

Test performed :

SPELL_EVENT_ON_PREPARE = 1
SPELL_EVENT_ON_CAST = 2
SPELL_EVENT_ON_CAST_CANCEL = 3

-- Test function for SPELL_EVENT_ON_PREPARE
local function OnSpellPrepare(event, caster, spell)
    print("Test: OnPrepare triggered for spell ID:", spell:GetEntry())
end

-- Test function for SPELL_EVENT_ON_CAST
local function OnSpellCast(event, caster, spell, skipCheck)
    print("Test: OnCast triggered for spell ID:", spell:GetEntry(), "SkipCheck:", skipCheck)
end

-- Test function for SPELL_EVENT_ON_CAST_CANCEL
local function OnSpellCastCancel(event, caster, spell, bySelf)
    print("Test: OnCastCancel triggered for spell ID:", spell:GetEntry(), "Cancelled by self:", bySelf)
end

-- Register events for Fireball (ID: 133)
RegisterSpellEvent(133, SPELL_EVENT_ON_PREPARE, OnSpellPrepare)
RegisterSpellEvent(133, SPELL_EVENT_ON_CAST, OnSpellCast)
RegisterSpellEvent(133, SPELL_EVENT_ON_CAST_CANCEL, OnSpellCastCancel)

Results:

Desktop.2025-01-22.17-11-52.1.mp4