Changelog of @hackage/sqlite-easy 0.2.0.0

Rework the API
- Introduce the SQLite a type instead of Database -> IO a for run, runWith, withDB, migrate, and so on.
- Introduce withPool and export liftIO, fromString and void.
- Depend on unliftio-core and mtl.
Implement nested transactions via savepoints.
- asTransaction renamed to transaction
- cancelTransaction split to rollback and rollbackAll