dcdpr / jp / 20434837080

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perf(conversation): optimize `InternalEvent` deserialization (#330)

Implement a custom `Deserialize` for `InternalEvent` to reduce memory
allocations during deserialization.

Profiling with `dhat` identified the default derived deserialization as
a hotspot due to excessive buffering when handling the enum variants.
This change introduces a flattened internal helper enum to allow Serde
to match the type tag directly and construct the `ConversationEvent`
efficiently, avoiding the overhead of the previous structure.

Signed-off-by: Jean Mertz <git@jeanmertz.com>

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