Make module self-register (Worker threads fix)

[Twixes]

node-rdkafka was incompatible with Worker threads due to legacy context awareness, this fixes the issue for relevant versions of Node.js (>=10.7.0), retaining the old behavior for versions before that. Giving credit where its due, used guidance from nodejs/node#21783 (comment) and work already made in the node-lzo code base.
Test included.
Resolves #831.

[iradul]

Thanks for the PR.
I've run a few local tests after merging this and I've got occasional crashes. It seems we may need to do more work on this to make the library reliably runs within worker threads.

[Twixes]

Yeah, us at PostHog too. Had some awful segfaults. We've since switched to https://kafka.js.org/ and it's a much smoother experience, though probably somewhat less performant than tapping into C.

[yunnysunny]

I have try change the addon library from Nan to node-addon-api to support Worker threads. But I'm not familiar with C++, it also have some bugs. The project link: https://github.com/node-rdkafka-next/node-rdkafka-next

[Twixes]

I've switched to NAN_MODULE_WORKER_ENABLED here, which should be exactly the right (and official) macro for this. All tests green, but some stability tests need to be done here to ensure there are no crashes.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[Twixes]

What does this solution look like to you?

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.