feat(Core/Hooks): added collection of hooks to extends AC (#3047)

This collection of hooks comes from the Maelstrom project. It allows to release modules such as :
- 3v3-soloqueue
- 1v1 arena
- pvestats

and many others

src/server/game/Instances/InstanceSaveMgr.cpp

@@ -134,11 +134,14 @@ bool InstanceSaveManager::DeleteInstanceSaveIfNeeded(InstanceSave* save, bool sk
 InstanceSave::InstanceSave(uint16 MapId, uint32 InstanceId, Difficulty difficulty, time_t resetTime, time_t extendedResetTime)
     : m_resetTime(resetTime), m_extendedResetTime(extendedResetTime), m_instanceid(InstanceId), m_mapid(MapId), m_difficulty(IsSharedDifficultyMap(MapId) ? Difficulty(difficulty % 2) : difficulty), m_canReset(true), m_instanceData(""), m_completedEncounterMask(0)
 {
+    sScriptMgr->OnConstructInstanceSave(this);
 }
 
 InstanceSave::~InstanceSave()
 {
     ASSERT(m_playerList.empty());
+
+    sScriptMgr->OnDestructInstanceSave(this);
 }
 
 void InstanceSave::InsertToDB()
@@ -169,6 +172,8 @@ void InstanceSave::InsertToDB()
     stmt->setUInt32(4, completedEncounters);
     stmt->setString(5, data);
     CharacterDatabase.Execute(stmt);
+
+    sScriptMgr->OnInstanceSave(this);
 }
 
 time_t InstanceSave::GetResetTimeForDB()