Add `serde` feature and implement `Serialize`/`Deserialize` for `Bytes` #481

Add `serde` feature and implement `Serialize`/`Deserialize` for `Bytes`

Usage Workflow file

16 warnings

The following actions uses node12 which is deprecated and will be forced to run on node16: actions-rs/toolchain@v1, actions/checkout@v2, actions-rs/cargo@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

The following actions uses Node.js version which is deprecated and will be forced to run on node20: actions-rs/toolchain@v1, actions/checkout@v2, actions-rs/cargo@v1. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

`D:\a\safer_ffi\safer_ffi\.cargo\config` is deprecated in favor of `config.toml`

D:\a\safer_ffi\safer_ffi\Cargo.toml: `default_features` is deprecated in favor of `default-features` and will not work in the 2024 edition

field `dyn_` is never read

fields `Trait`, `intro_trait_generics_and_lt`, `fwd_trait_generics_and_lt`, and `trait_where_clause` are never read

`safer_ffi-proc_macros` (lib) generated 2 warnings

unused attribute `doc`

unused attribute `doc`