Native Fastify plugin

[brandonp42]

As a follow-up to #62 would it be possible to have a native Fastify plugin instead of relying on the Express compatibility? Per https://github.com/fastify/fastify-express it says "This plugin should not be used as a long-term solution, it aims to help you have a smooth transition from Express to Fastify, but you should migrate your Express specific code to Fastify over time."

Thank you!