serdect: no_alloc implementation of serialize_hex#2327
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This previously mandated use of `alloc` and would simply return an error when used without the feature enabled. This uses `serde`'s built-in integration with `core::fmt` along with the `base16ct::HexDisplay` type to implement a simple `no_alloc` serializer.
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This previously mandated use of
allocand would simply return an error when used without the feature enabled.This uses
serde's built-in integration withcore::fmtalong with thebase16ct::HexDisplaytype to implement a simpleno_allocserializer.