Added script for creature 6066 (Earthgrab Totem)

Workaround because creature 6066 (Earthgrab Totem) is summoned by spell
8376 which has wrong spell effect SPELL_EFFECT_SUMMON_GUARDIAN instead
of spell effect SPELL_EFFECT_SUMMON_TOTEM_SLOT1 preventing the summoned
creature to properly use the TotemAI. Hence, we have to emulate the
right AI with ACID (eventAI)