Farris

Return logprobs from generate api

1

Continuation of https://github.com/ml-explore/mlx-examples/issues/894#issuecomment-2236464052 Could be incorporated into new function altogether but proposing to build into existing `generate` as the logic is minimal... Thanks 😄

### System Info - ### Information - [ ] The official example scripts - [ ] My own modified scripts ### 🐛 Describe the bug Would be great to get...