feat: treat unhandled interceptor exceptions as 500 responses

[kettanaito]

• Fixes #516

Much like request handlers in MSW, everything you write in your interceptors is from the server's perspective. If an exception happens on the server, it's usually handled gracefully as the 500 error response to the client. This consistency is nice for predictability but also aligned behavior across the low-level Interceptors and high-level MSW.

Changes

• Any exceptions thrown in the request listeners are now coerced to 500 Unhandled Exception mocked error response to emulate server suffering an exception.
• To mock request errors, do request.respondWith(Response.error()).

[kettanaito]

Released: v0.28.0 🎉

This has been released in v0.28.0!

• 📄 Release notes
• 📦 npm package

Make sure to always update to the latest version (npm i @mswjs/interceptors@latest) to get the newest features and bug fixes.

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