Optimize broadcast logic in Hub for better performance

[coderabbitai]

The method in the package currently uses a goroutine for each data item. It is suggested to consider pooling goroutines or using a worker pattern to manage resources more efficiently. This improvement will be considered in a future pull request.\n\nPR URL: https://github.com/Bisonai/orakl/pull/2133\nComment URL: #2133 (comment)