chore: add boilerplate for Rust crates

[layershifter]

Related to #114.

This PR sets up Rust workspace and creates two crates with boilerplate. Nothing is ready to be published.

PR introduces a concept for the feature API:

• we provide plugins for bundlers
• a consumer will need to write a processor in Rust & build own binaries using napi-rs
• these binaries will be used by our bundler plugins

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Latest commit: 621f42f

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