Jacques/http integration

[jverre]

Title

Added Comet's Opik open-source observability integration for logging and evaluation.

For more information on Opik, see: https://github.com/comet-ml/opik

Hope you find this useful!

Type

🆕 New Feature

Changes

The integration was implemented following the Langsmith and Datadog integration.

1. Adds documentation: docs/my-website/docs/observability/opik_integration.md
2. Lists Opik in sidebar
3. Adds the integration: litellm/integrations/opik/opik.py
4. Added tests: tests/local_testing/test_opik.py

UI Changes

a screenshot/GIF of working UI fixes

Testing

All tests pass:

pytest tests/local