chore: add engines field to package.json

[MichaelDeBoey]

Just like I did in remix-run/remix#3360

[ryanflorence]

I'm not sure we need this? React Router doesn't know or care about Node.js. Is this just for development/contributing?

[MichaelDeBoey]

@ryanflorence It shows which Node/JS version is supported by the package.
It important for both development/contributing + for installing the package as a dependency of a project, as the code could maybe use newer API's, so we want to let the people using the package know that.

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[brophdawg11]

Thanks @MichaelDeBoey!