Implement some flow blocks

[evren-okcu]

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[artob]

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[artob]

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[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.