Add MapFrom block

[imunproductive]

A simple block to map one type to another, assuming it implements From trait.

[SamuelSarle]

LGTM after lint fixes

[evren-okcu]

following implementations seems to be missing:

implementation of Deserialize in file block_config.rs
as_str, from_str and blockinstantiaion trait implementation in block_tag.rs
build_stdio_system method in file lib.rs
StdioSystem trait implementation for Mapper block.

[evren-okcu]

Not sure if this is a 'core' block or 'flow' block. let's ask to @artob

[artob]

@race-of-sloths invite

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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]

@race-of-sloths score 8

[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.