Create alias itto_(genshin_impact) -> arataki_itto

BUR #7505 has been approved by @Hillside_Moose.

create alias itto_(genshin_impact) -> arataki_itto

Utility alias because a lot of people could know him by just the name Itto being thrown around online (like me)

The bulk update request #7505 (forum #198152) has been approved by @Hillside_Moose.