Jsmc boolean demo

[jsmcibm]

No description provided.

[jsmcibm]

This PR makes changes to the UI to support the backend used in the boolean demo. The UI changes are independent of changes in the orchestrator and services that are needed for this capability. I have tested that the UI continues to work with orchestrator/services built from main.

The corresponding change in services are on branch boolean-demo-backend2,
and the corresponding changes in orchestrator are on branch jsmc-boolean-demo.
These will be submitted in future PRs.

[kpfadnis]

@jsmcibm couple of clarifications/questions

1. @seirasto Is looking into supporting evidences as a list for generative readers. Can we adopt similar approach where answer text is set to YES/NO and evidences is a list of relevant passages with/without start and end offsets?

2. From end user perspective is it useful to highlight if we detected the question to be boolean or Factoid type? Does is alter user's satisfaction toward answer based on that visual cue?