Support of raw SQL triggers

What's Changed

• Update to EF Core 6 by @win7user10 in #17
• make it clear that Customization is not only for Sqlite by @fritz-net in #18
• fixed issue with table names not in lower case in postgresql by @fritz-net in #20
• Can use database keywords as column names by @zirou5055 in #21
• Feature/raw sql triggers by @win7user10 in #22

New Contributors

• @fritz-net made their first contribution in #18

Full Changelog: v1.1.0...v6.1.0