Implement the ZeroMQ transport

[SamuelSarle]

No description provided.

[github-actions]

⚠️ CI failed

Platform	Name	Status	Details
All	Formatting	✅	Details
Linux	Build library	❌	Details
Linux	Build binaries	✅	Details
Linux	Build tests	❌	Details
Linux	Build examples	✅	Details
Linux	Run tests	⏩	Details

[github-actions]

⚠️ CI failed

Platform	Name	Status	Details
All	Formatting	✅	Details
Linux	Build library	❌	Details
Linux	Build binaries	✅	Details
Linux	Build tests	❌	Details
Linux	Build examples	✅	Details
Linux	Run tests	⏩	Details

[imunproductive]

Currently CI fails due to this PR's new dependency on protoc. Fixed in PR #28

[imunproductive]

Some nit-picks that I've noticed while I was fixing CI. Didn't look thoroughly at the rest of the code but at the first glance looks good to me.

[imunproductive]

This file is auto-generated. Maybe it makes more sense to put it in generated/-like directory and add it to .gitignore?

[SamuelSarle]

I explicitly configure prost-build in build.rs to output the generated files to src/ as by default they go to the build directory (target/.../) and are imported with include!(concat!(env!("OUT_DIR"), "/your.proto.package.rs")).

So unless we have a preference against it, I'd place this in src/ and commit the generated file.

[github-actions]

⚠️ CI failed

Platform	Name	Status	Details
All	Formatting	✅	Details
Linux	Build library	❌	Details
Linux	Build binaries	✅	Details
Linux	Build tests	❌	Details
Linux	Build examples	✅	Details
Linux	Run tests	⏩	Details

[github-actions]

⚠️ CI failed

Platform	Name	Status	Details
All	Formatting	✅	Details
Linux	Build library	❌	Details
Linux	Build binaries	✅	Details
Linux	Build tests	❌	Details
Linux	Build examples	✅	Details
Linux	Run tests	⏩	Details

[artob]

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[github-actions]

⚠️ CI failed

Platform	Name	Status	Details
All	Formatting	✅	Details
Linux	Build library	❌	Details
Linux	Build binaries	❌	Details
Linux	Build tests	❌	Details
Linux	Build examples	❌	Details
Linux	Run tests	⏩	Details
Linux	Run doctests	⏩	Details

[artob]

Important

Protoflow has been discontinued and archived in favor of its successors Async-Flow and Flows.rs, which represent the future of flow-based programming in Rust and offer a substantially better developer experience as well as simply higher development velocity. We aim to eventually port the functionality in this pull request over to Flows.rs; if you'd like to contribute to make that happen sooner, please raise an issue and/or pull request against that repository.