feat: support using session to execute statements in transaction (#3252)

core/stores/sqlx/errors.go

@@ -0,0 +1,14 @@
+package sqlx
+
+import (
+	"database/sql"
+	"errors"
+)
+
+var (
+	// ErrNotFound is an alias of sql.ErrNoRows
+	ErrNotFound = sql.ErrNoRows
+
+	errCantNestTx    = errors.New("cannot nest transactions")
+	errNoRawDBFromTx = errors.New("cannot get raw db from transaction")
+)