feat!: rework

[climba03003]

I would like to gather initial though on the implementation likes the previous one. I do not plan to support more tools at this stage, mocha, tap, standard, etc. Let's focus on the implementation.

You can use npx fastify-dev for development, it can skip the build step and use directly. npx fastify for checking the built one.

Mentions someone that are interested. cc @jean-michelet

Checklist

• [ ] run npm run test and npm run benchmark
• [ ] tests and/or benchmarks are included
• [ ] documentation is changed or added
• [ ] commit message and code follows the Developer's Certification of Origin and the Code of conduct