feat: logx support logs rotation based on size limitation. (#1652)

implementation of #1652

Totally compatible with the old logx.LogConf. No effect if users do not change their options.

core/logx/rotatelogger.go

@@ -434,7 +434,7 @@ func getNowDate() string {
 }
 
 func getNowDateInRFC3339Format() string {
-	return time.Now().Add((-24*60 + 5) * time.Minute).Format(rfc3339DateFormat)
+	return time.Now().Format(rfc3339DateFormat)
 }
 
 func gzipFile(file string) error {