Update cli providers package according to golang conventions

[bilge-cakmak]

According to #PR3904reviews the cli/pkg/providers/provider.go package's Provider interface needs to be improved. And the changes should be reflected on cli/pkg/providers/provider_name_here.

Recommendations are below:

All providers' go files has this function below. It is always better to return a struct and not a pointer specially when the struct only contains pointers

func New(w io.Writer, analytics *console.AiryAnalytics) *provider {
	return &provider{
		w:         w,
		analytics: *analytics,
	}
}

For Provision() function:

• console.Exit will kill the process, so in case of error this function will never return. those error is always nil. in this case there is golang convention for this.
  The function should not return a value, and it is better if you call it MustProvision