Changes:
* Fix for panic vulnerability on crafted input (CVE-2023-42444)
  See https://github.com/whisperfish/rust-phonenumber/security/advisories/GHSA-whhr-7f2w-qqj2
* Avoid a panic when extracting country id
* Add PhoneNumber::number_type
* Adds many test cases

This is most probably the last release in the 0.3 series; we are
queueing some breaking changes.