concat method

Implementation

@override
LLMResult concat(final LanguageModelResult<String> other) {
  return LLMResult(
    id: other.id,
    output: output + other.output,
    finishReason:
        finishReason != FinishReason.unspecified &&
            other.finishReason == FinishReason.unspecified
        ? finishReason
        : other.finishReason,
    metadata: {...metadata, ...other.metadata},
    usage: usage.concat(other.usage),
    streaming: other.streaming,
  );
}