ref(litellm): migrate litellm wrapper to integrations API#160

Abhijeet Prasad (AbhiPrasad) merged 3 commits intomainbraintrustdata/braintrust-sdk-python:mainfrom

abhi-feat-litellm-integrations-api-migrationbraintrustdata/braintrust-sdk-python:abhi-feat-litellm-integrations-api-migrationCopy head branch name to clipboard