Support Cadence engine as backend

[longquanzheng]

Hi Couler team
I come from https://github.com/uber/cadence and and seeing you are working on Couler and it's an awesome project!
Could you also support Cadence as well.

https://eng.uber.com/open-source-orchestration-tool-cadence-overview/
There are already companies using Cadence in production like https://doordash.engineering/2020/08/14/workflows-cadence-event-driven-processing/
https://banzaicloud.com/blog/introduction-to-cadence/

I think these two projects will create better workflow technology by working together!

Thanks

[terrytangyuan]

Thanks for submitting the issue! We definitely would like to see the support for additional workflow engines. Would anyone in Cadence team or from the community like to submit a proposal on what the implementation looks like that aligns with the current Couler core APIs?

[merlintang]

Hi @longquanzheng, can you first proposal the core api used for cadence? we can discuss it from there.