2.0 Migration - Phobos -> Karafka

[dorner]

This is a placeholder for the work needed for the v2 branch, which is a rewrite of Deimos backed by Karafka instead of Phobos. This is a large-scale rewrite.

@newbray @2rba @yannp @mikdiet @iMacTia - if you're still using this library, please take a look at the v2 upgrade guide and let me know if there are any breaking changes that are blockers for you. In particular, there are a few features I removed because I knew we weren't using them in our company - I can definitely look at bringing them back if they are used elsewhere.

Please feel free to comment on this issue if you have questions or anything else you'd like to discuss!

[iMacTia]

This is great news! Congrats on the huge milestone 👏

We're still very much using Deimos so I'll definitely take a look next week and let you know if there's anything critical we rely on that is going away ❤️

[iMacTia]

@dorner I read the v2 upgrade guide and couldn't really see anything there that would cause us issues.
Once v2 is ready for production usage drop us a message and we'll be happy to give it a go

[dorner]

Will do! This is currently blocked on karafka/karafka#2108 as well as internal review and testing. I'll update this issue with info as it changes. Thanks!