Add API to worker thread to check whether main thread is TTY

What is the problem this feature will solve?

In worker threads, process.stdout.isTTY and process.stderr.isTTY are undefined. However, they do forward stdout/stderr to the main thread, and the main thread could potentially be isTTY === true. This makes sense as some things don't work, like raw mode. However, things that produce colors would want to be able to detect that the main thread is TTY, so colors can be shown when logged from a worker thread.

What is the feature you are proposing to solve the problem?

Add an API to worker threads to check whether stdout/stderr in the main thread is TTY.

This is needed for color packages like chalk to be able to support showing colors when running in worker threads.

Relevant issue: https://github.com/nodejs/node/issues/26946

What alternatives have you considered?

No response

まず worker_threads API と関連する issue #26946 を読み、次に worker から出力が転送されるときの process.stdout.isTTY と process.stderr.isTTY の挙動を追跡します。提案された worker-thread API でメインスレッドの stdout と stderr の TTY 状態を検出でき、color-package のユースケースをカバーできれば完了です。