facet-rs / facet / 19931906981

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feat(facet-json): add from_slice_owned and from_str_owned for owned deserialization

Add new deserialization functions that don't require input to outlive the result.
This enables deserializing from temporary buffers (e.g., HTTP request bodies in axum).

Changes:
- Add `allow_borrow` field to JsonDeserializer
- Add `new_owned()` constructor that disables borrowing
- Add `from_slice_owned` and `from_str_owned` public functions
- Add runtime checks to error when attempting to deserialize into `&str` with borrowing disabled
- Add comprehensive tests for owned deserialization

The owned variants use `Facet<'static>` bounds to ensure the target type
contains no borrowed data, and runtime checks prevent storing borrowed
references into the output.

Fixes #1052

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