Keira3: align LegionCore database structure for this tool

[jasongdove]

Description:

As much fun as it is to manually create SQL for every database change, we should work to support existing tooling, specifically Keira3 https://www.azerothcore.org/Keira3/

Legion fork at https://github.com/The-Legion-Preservation-Project/Keira3

TODO:

• Enable SmartAI editing
• Enable Quest editing
• Enable Gossip Menu editing
  • Partial support added in Core/Gossip: refactor gossip menu tables and separate gossip_option_mailbox #181
• Enable Creature editing
  • Enable Creature Text editing
    • Partial support added in DB/Misc: rename creature_text.Entry to creature_text.CreatureID #196
• Support multiple database connections (i.e. LegionCore hotfixes db vs AzerothCore *_dbc tables in world db)
• ???