Add a JavaScript module for easier access to data

[nschonni]

While looking to implement this for nodejs/i18n, I found myself looking at what Browserlist was doing, and re-implementing it.
EX:

const schedule = require(node-releases).schedule // expose the release-schedule.json object
const nodejs = require(node-releases).nodejs// expose the release-schedule.json object

Other useful functions would be to have the functions to just return active releases

[chicoxyzzy]

I think that if we want to add JS module, we can do better and pre-generate a flat CJS/ESM modules without the need to require and parse JSON.

[nschonni]

I did a placeholder example over in #21
Did you have an idea on how the generation approach would work?

[jimmywarting]

fyi, there is also the possibility of using import type assertion
cjs is obsolete

import { schedule } from 'node-release/data.json' assert { type: 'json' }

or for the just of simplicity export a esm file