Add golangci-lint action

[anusha94]

Description:

To make the code more uniform and readable, it is better to run it against a linter. golangci-lint is quite popular for Go based projects and it also comes with a GitHub action that can be setup to run on every PR.

What needs to be done?

• create a new CI workflow that runs on every PR and push to main
• you may encounter errors in existing code when you run the linter, fix those
• note that not all linting actions maybe suitable for the project or maybe an overkill, feel free to exclude those