facet-rs / facet / 19931212358

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feat(facet-core): add Write trait for no_std serialization

Move the Write trait from facet-json to facet-core so it can be reused
by other format crates (facet-yaml, facet-xml, etc.) for no_std support.

- Add `Write` trait to facet-core with `write(&[u8])` and `reserve(usize)`
- Implement `Write` for `Vec<u8>`, `&mut Vec<u8>` (with alloc feature)
- Implement `Write` for `bytes::BytesMut` (with bytes feature)
- Re-export as `JsonWrite` in facet-json for backwards compatibility
- Add `to_writer_std` and `to_writer_std_pretty` functions in facet-json
  that accept `std::io::Write` (with std feature, enabled by default)

Closes #1050

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