Add custom inspect for node without depedency

[pedropedruzzi]

Adds back the custom inspection functions for node.js, first added by #281 then removed by #318 and [55ac17e]. This change avoids the default node's object inspection listing all fields recursively. This time there are no node imports or any run-time dependency. We simply expose the inspect functions as symbol-named attribute Symbol.for('nodejs.util.inspect.custom') as described in the docs.

Note: I've simplified the formats from the original addition to make it single line and simpler.

Testing done

• npm run build
• npm run format-check
• ./scripts/test
• Manual

  
  const { DateTime, Duration, Interval } = require('./build/cjs-browser/luxon')
  Duration.fromObject({ seconds: 10 })
  Interval.fromDateTimes(DateTime.now().minus({ days: 1 }), DateTime.now())
  DateTime.now()

// output: Duration { values: {"seconds":10} } Interval { start: 2023-10-09T16:20:51.017-03:00, end: 2023-10-10T16:20:51.019-03:00 } DateTime { ts: 2023-10-10T16:20:59.623-03:00, zone: America/Sao_Paulo, locale: en-US }

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: pedropedruzzi / name: Pedro Pedruzzi (6fb10c2bb1e8af548ac122eb3a3db75bd82bc058)

[icambron]

This looks good, thanks