Refactor Logger (#13294)

Refactor Logger to make a logger interface and make it possible to
wrap loggers for specific purposes.

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

modules/indexer/code/elastic_search.go

@@ -40,7 +40,7 @@ type ElasticSearchIndexer struct {
 }
 
 type elasticLogger struct {
-	*log.Logger
+	log.Logger
 }
 
 func (l elasticLogger) Printf(format string, args ...interface{}) {