Remove the package name check

[yeya24]

Current we are checking the package name of prometheus or promauto, actually this is not very necessary. We can just check the Method being called.

	for _, pkg := range file.Imports {
		switch pkg.Path.Value {
		case `"github.com/prometheus/client_golang/prometheus"`:
			if pkg.Name != nil {
				name = pkg.Name.Name
			} else {
				name = "prometheus"
			}

		case `"github.com/prometheus/client_golang/prometheus/promauto"`:
			if pkg.Name != nil {
				promautoName = pkg.Name.Name
			} else {
				promautoName = "promauto"
			}
		}
	}

[yeya24]

This is done, close.