feat: support RequestController with source

[kettanaito]

Warning

BREAKING CHANGE: We now handle mock response stream errors the same way Node.js handles them: write response headers as-is (e.g. 200 OK), then emit "error" on the response and abort the request without request errors. Previously, we coerced mock response stream errors to 500, which was wild magic and we shouldn't have done that.

• Closes fix(MockHttpSocket): handle response body streaming errors correctly #742 (potentially fixes)
• Fixes Coercion of stream errors to 500 fails because headers have already been sent #738
• Pre-requisite to feat: support cross-process interception via setupRemoteServer msw#1617

Changes

Make the RequestController class accept a source object that implements the request handling methods (passthrough/respondWith/errorWith). We might eventually use this instead of the network frames in MSW as they are, effectively, the same thing.

Follow-ups

• Make RequestController methods asynchronous to have a consistent function flow.
• Breaking change: short-circuit request listener invocations as soon as one of them handles the request (now, we allow all listeners to run; also relied on in tests).

Todos

• Confirm nock tests are passing with this change.
• Confirm msw tests are passing with this change.

[kettanaito]

Released: v0.40.0 🎉

This has been released in v0.40.0!

• 📄 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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