Fix issues with evaluation code

[jlewi]

• Fix Link Eval Results To Traces #131 - store the generate trace in the EvalExample this will make it possible to look up the trace associated with an evaluation result so we can see how it was generated.

• To support this we add trace id to the GenerateResponse

• Fix incorrect value in case where AI returns no code cells - Fix Eval Results - Have Distance -1 and Normalized Distance of 0 #132

  • We weren't actually computing the distance so we were getting whatever the initialization values were
  • This caused normalized distance to be 0 which is very misleading
  • If no code blocks are returned then we should set the distance to be the maximum possible distance
    • In which case normalized distance will end up being 1
  • To achieve that we should set the command to be the empty string and then compute the distance.

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