Integrate node-streams-aff into library

[JordanMartinez]

Description of the change

Copies node-streams-aff and its tests into this library, excluding two APIs: newReadable and push. I think that function could be better supported to allow for custom streams, but I didn't port that or implement my own version for two reasons:

1. I didn't want to think through what that would be yet.
2. Per the tests, it seemed like it was only used to produce a Readable from a String, which has been supported via fromString.

@jamesdbrock, can you take a look at this?

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Checklist:

• Added the change to the changelog's "Unreleased" section with a reference to this PR (e.g. "- Made a change (#0000)")
• Linked any existing issues or proposals that this pull request should close
• Updated or added relevant documentation
• Added a test for the contribution (if applicable)

[JordanMartinez]

I'll merge this for now, but if there are any other changes we should make, we can do it in a future PR.

[jamesdbrock]

I'll merge this for now, but if there are any other changes we should make, we can do it in a future PR.

Great, thanks. I'll check this out later.

[JordanMartinez]

@jamesdbrock Have you had a chance to review this? Since this repo hasn't had a new release yet, it's blocking the other work I've done.

[jamesdbrock]

Yeah looks great. I see you've swapped in all the new EventEmitter stuff and you've got all the tests passing.

[jamesdbrock]

The foreign imports in the tests is weird though, why was that necessary? Can't those foreign imports be imported instead from other purescript-node packages?

[JordanMartinez]

The foreign imports in the tests is weird though, why was that necessary? Can't those foreign imports be imported instead from other purescript-node packages?

Unfortunately, no, because all of those depend on node-streams.