Remove `package.json` `engines`

[timfish]

This package currently defines:

  "engines": {
    "node": ">=20"
  },

• TracingChannel requires Node >= v19.9.0 or v18.19.0
• module.register requires Node >= v20.6.0, v18.19.0

So if engines was to follow the features used in this library it should probably be >=v18.19.0 | >=v19.9.0 | >=v20.6.0

However, we would prefer to have no engines defined because then we can selectively use this library when the Node version is supported.

Currently there is no way for us to use this library in production because it will fail to install on Node versions we still support.

[jsumners-nr]

I think (package.json).engines is a useless field. It's not enforced by anyone.