feat: Add MySQL ent-based storage driver

Signed-off-by: m.nabokikh <maksim.nabokikh@flant.com>

storage/ent/sqlite.go

@@ -33,12 +33,10 @@ func (s *SQLite3) Open(logger log.Logger) (storage.Storage, error) {
 		return nil, err
 	}
 
+	// always allow only one connection to sqlite3, any other thread/go-routine
+	// attempting concurrent access will have to wait
 	pool := drv.DB()
-	if s.File == ":memory:" {
-		// sqlite3 uses file locks to coordinate concurrent access. In memory
-		// doesn't support this, so limit the number of connections to 1.
-		pool.SetMaxOpenConns(1)
-	}
+	pool.SetMaxOpenConns(1)
 
 	databaseClient := client.NewDatabase(
 		client.WithClient(db.NewClient(db.Driver(drv))),