Style <example> and <input> in our evaluation reports

[jlewi]

Follow on to #288.
#288 added GetEvalResult which generates a report displaying evaluation results. One such HTML report is attached.

The LLM request is quite long and includes examples enclosed in "". To make the request more legible we'd like to style the examples differently; i.e. create seperate headings for each example.

There are two ways we could potentially do this

1. Just parse and edit the raw markdown
2. Create custom HTML tags corresponding to .

01J8NQZV7BX0FB3S0RSGSZ12XB.evalresult.html.txt