Track explanation that is generated by LLM when making ratings.. (Could also be done by humans ;-) )

[epugh]

Description

Add a "explanation" field.

Motivation and Context

LLM's give us detailed explanations "for free", so let's capture that thinking since we can't talk to them as a human directly!

Plus, as a human, we should explain why we can't vote on something.....

How Has This Been Tested?

Screenshots or GIFs (if appropriate):

Types of changes

• [] Bug fix (non-breaking change which fixes an issue)
• [] Improvement (non-breaking change which improves existing functionality)
• [] New feature (non-breaking change which adds new functionality)
• [] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [] My code follows the code style of this project.
• [] My change requires a change to the documentation.
• [] I have updated the documentation accordingly.
• [] I have read the CONTRIBUTING document.
• [] I have added tests to cover my changes.
• [] All new and existing tests passed.