[BB3] Return token logprobs when scoring or generating.

[davides]

Patch description

• Updates BB3OPTAgent to pass along the token log-probs returned by OPT. This enables evals that require fine-grained access to that information.
• Also ensures that the following keys are always set whether scoring labels or generating new text: text, logprobs, token_logprobs

Testing steps Ran a few evaluations from metaseq.

Other information N/A

[klshuster]

hey @davides, is this ready for review?

[davides]

hey @davides, is this ready for review?

Still have a few more local changes to add. I'll clean things up a bit and move it to open once ready.

[github-actions[bot]]

This PR has not had activity in 30 days. Closing due to staleness.

[klshuster]

Hey @davides, should we close this or are you still working on it?

[github-actions[bot]]

This PR has not had activity in 30 days. Closing due to staleness.