GetNpmRC find the .npmrc file in system and parse it will find from `pwd`, then $HOME folder.

NormRegURL make sure reg url has a `/` suffix.

ParseNpmRc parse main reg url and token npmrc declares in ini format https://docs.npmjs.com/cli/v10/configuring-npm/npmrc we only get default registry and all the tokens auth scoped settings and other auth method is not yet implemented.