Distribute interceptors properly

[kettanaito]

Expected behavior

• Exported under node-request-interceptor/interceptors/[name]
• Distributed in a format that would allow them to be imported from both ESM and CJS context (currently importing an interceptor directly from a ESM context doesn't compile, it strips away named export of SocketPolyfill).

[kettanaito]

I've tried building each interceptor as a separate CJS module, but that produces the same result as with the current setup.

It comes down to which format the entire NRI should be distributed. I believe that should be CJS, as you can use CJS in another CJS context, while in ESM context you are likely to ignore transformation of CJS modules.

[kettanaito]

Can use symlinks or empty folders like we do in msw/node:

interceptors/
  fetch/
    package.json
  ClientRequest/
    package.json

Can also use "exports" in package.json but TypeScript doesn't play nicely with it.

[kettanaito]

I also think the import pattern should be

import interceptor from '@mswjs/interceptors/[interceptor]'

[kettanaito]

We can use "exports" in package.json to do this but it'll only work in ESM, I assume.

[kettanaito]

Already implemented in #313.