Hamcrest Matchers for tests & NINO validation

Previously, Hamcrest Matchers were scoped for tests, but we want to bundle it as part of the framework. No longer will users have to manage their own Hamcrest dependency.

We work with government, and lots of tests have to verify National Insurance numbers. We're pulling in dependency in this release to utilise the publicly available nino-validator project kindly published on UK Gov DWPs public GitHub.