Bug fix/writable stream validator

[Bluebberies]

Bug Explanation: Invalid Stream Type for Ora Spinner

Summary

The ora library requires that the stream option passed during spinner initialization be a writable stream. If a non-writable stream or an object that lacks a write method is provided, it throws a TypeError.

Reproduction Steps

1. Import the ora library.
2. Create an object that does not have a write method (e.g., a plain object or a read-only stream).
3. Attempt to initialize ora with this object as the stream option.

Example Code

const ora = require('ora');
const myStream = {}; // Non-writable stream
const spinner = ora({ stream: myStream });

The above code will return an unhandled exception 


**Fix**

if (options?.stream && typeof options.stream.write !== "function") {
    throw new TypeError("Stream must be a writable stream");
}

This check indicates that the ora spinner accepts a stream option, which should be a writable stream. The bug arises when the provided stream option does not conform to this expectation. A common real-world scenario that can lead to this issue is passing a non-writable stream (like a read-only stream) to the ora instance.

[sindresorhus]

The message should be asserted here too.