QA-11: Potential Per-Entry Memory Leak in traverse_callback

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pub unsafe extern "C" fn traverse_callback(
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    op_kind: bindings::triedb_async_traverse_callback,
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    context: *mut std::ffi::c_void,
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    key_ptr: *const u8,
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    key_len: usize,
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    value_ptr: *const u8,
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    value_len: usize,
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) {
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    let traverse_context = unsafe { Box::from_raw(context as *mut TraverseContext) };
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    // ...
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    let key = unsafe { std::slice::from_raw_parts(key_ptr, key_len).to_vec() };
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    let value = unsafe { std::slice::from_raw_parts(value_ptr, value_len).to_vec() };
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    {
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        let mut lock = traverse_context.data.lock().expect("mutex poisoned");
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        lock.push(TraverseEntry { key, value });
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    }
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    let _ = Box::into_raw(traverse_context);
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}