Use phonenumberslite as a dependency

The `phonenumbers` package has created a smaller packade aimed for simpler
use cases, like this module. So in case the user doesn't have any package
`phonenumbers` installed at all then try to install `phonenumberslite`.

Since both `phonenumbers` and `phonenumberslite` installs into the same
folder this will only add the dependency if there is no package installed
prior, and if someone already got the full package that will also play ball.