Experimenting with more structured ways to handle command-line input/output in Rust

Merge `cli_macros` shim into `fluent_embed`

Part of an extended cleanup effort, fluent_embed will likely get renamed to fluent_embed_derive and fluent_embed_runtime will take its place, re-exporting the macro similar to serde.

Created by  finchie  on July 29, 2024
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