chore: improve no_std maintainability:
#1047
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Similar to how `rustls` does it: https://github.com/rustls/rustls/blob/513e374b2e2ce9f1fb57ac78ab3ca053afc8f133/rustls/src/lib.rs#L353-L359 > ... `extern crate` plus the `#![no_std]` attribute changes the default prelude from `std::prelude` to `core::prelude`. That forces one to _explicitly_ import (`use`) everything that is in `std::prelude` but not in `core::prelude`. This helps maintain no-std support as even developers that are not interested in, or aware of, no-std support and / or that never run `cargo build --no-default-features` locally will get errors when they rely on `std::prelude` API.
Makes it easier to fix tokio-rs#939 because there were places where the prost_path setting was being ignored when direct a direct alloc path would suffice: https://github.com/tokio-rs/prost/blob/691454307ccd2de4c780438da8acf2a1ddd994f6/prost-build/src/code_generator.rs#L648
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Similar to how
rustlsdoes it:https://github.com/rustls/rustls/blob/513e374b2e2ce9f1fb57ac78ab3ca053afc8f133/rustls/src/lib.rs#L353-L359