[FR]: Allow free text annotations for spans and traces

[tmarice]

Proposal summary

Currently Opik allows only 2 types of annotations: categorical and numerical. I propose to add a third type: free text.

Motivation

This would allow non-technical domain experts to evaluate the output of each step in the prompting process for a dataset sample, and highlight where the model made a wrong decision. Currently this is not possible, and this type of evaluation has to be made in other tools (e.g. spreadsheets).

[jverre]

We had a similar request here #858 - since it's come up a few times now we will work on adding this

To help with the final implementation, do you need this for review experiments or annotating traces ?

[tmarice]

We need this for annotating traces.

[jverre]

@tmarice We are working on this, will be adding comment support at a trace and experiment level. Should be available in ~a week 😃