facet-rs / facet / 20009744255

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feat: add container-level proxy attribute support (#1109)

Allow `#[facet(proxy = ProxyType)]` at the struct/enum level, so any
field of that type automatically uses the proxy without per-field
annotations. This includes nested types like `Vec<Mine>`, `Option<Mine>`.

Key changes:
- Add ProxyDef type to store proxy shape and conversion functions
- Add proxy field to Shape struct with O(1) lookup
- Update ShapeBuilder with proxy() method
- Update macro codegen for structs and enums to handle container proxy
- Add custom_serialization_from_shape to Peek for serialization
- Add begin_custom_deserialization_from_shape to Partial for deserialization
- Update facet-json serializer/deserializer to check shape-level proxy
- Field-level proxy takes precedence over container-level proxy
- Add comprehensive tests for container-level proxy feature

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