feat: add database wrapper interfaces for mssql and postgres

Introduce a DB dialect interface and per-dialect wrappers that expose connection, query and column type operations with pre/post SQL hooks.

cmd/go_migrate/log.go

@@ -13,5 +13,5 @@ func configureLog() {
 		DisableSorting:  false,
 		PadLevelText:    true,
 	})
-	log.SetLevel(log.InfoLevel)
+	log.SetLevel(log.DebugLevel)
 }