Add user input thumbs up and down reaction

[suwhang-cisco]

Hey, I just made a Pull Request!

User can react to message with thumbs up or down. Enable by e.g. adding

  enableFeedback: true
  feedbackEndpoint: https://jarvis.dev.outshift.io/submit_feedback # this doesn't work for local development as Jarvis uses backstage deployemnt origin for token validation. You'll get 401 error

to app-config.yaml.

By default it's disabled and won't show the thumbs.

It uses backstage token to send to feedback. However in future, maybe this should be configurable to choose between id token and backstage token.

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