[Tony133]

Proposal:

• This PR removes the files field from package.json, aligning this repository with the other repositories in the org.
• It also reorders the package.json keys to follow the same structure used across the org (e.g. process-warning), and adds an explicit main entry point.

Notes:

• See the internal discussion: https://github.com/orgs/fastify/discussions/103
• Ref PR: chore: remove files field from package.json session#361