Find unreachable functions with deadcode if any

[KeranYang]

https://go.dev/blog/deadcode

Run the tool under the cmd folder to identify. Look for opportunities to clean up.

[rishhavv]

@KeranYang we only want do deadcode lookup on cmd folder?

[KeranYang]

Hey @rishhavv , thanks for looking at the issue. I think cmd folder is the entrance of the platform(container). The tool always starts checking from the main function. Starting from cmd it should be able to cover most of the pkgs.