Search message contents in log viewer

[tadamcz]

Current behaviour

The log viewer offers some filtering, including on the contents of the input and target fields:

Feature suggestion

Enable filtering on message contents, e.g. via an option named message_contains.

Perhaps one would want to filter on the role or other attributes of the message as well, e.g. find samples where a particular string appears in Assistant messages.

Challenges

I realise this may be non-trivial, since the text to search through may be large. In addition, when using the .eval format, the text to search through will be in the sample-level files, not in the header or summary files.