Add unique and exists rules

• refactor: define vine types within the provider ceec581
• refactor: do not promopt for db selection when --db flag is used 58244db
• refactor: create tmp directory during configure for sqlite dialect c952219
• feat: add unique and exists validation rules ef6fbc3
• refactor: remove useTz flag from timestamps 0ebd2ee
• fix: invalid migration alter stub 811e059
• feat: add type info for db:query event 1e5bab3
• refactor: do not import env when using sqlite driver 797957d

Full Changelog: v19.0.0-4...v19.0.0-5