Add SAP AI hub as new provider

[vasilisazayka]

Add SAP AI hub as new provider

Type

🆕 New Feature
✅ Test

Pre-Submission checklist

Please complete all items before asking a LiteLLM maintainer to review your PR

• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement
• I have added a screenshot of my new test passing locally
• My PR passes all unit tests on make test-unit
• My PR's scope is as isolated as possible, it only solves 1 specific problem

Changes

• Added SAP Generative AI Hub as an LLM provider (provider key: "sap"), supporting chat and embeddings.
• Registered SAP models under the sap/* namespace (e.g., sap/gpt-4o) in the model registry.
• Updated provider enum to include SAP; introduced handler and transformation layers for chat completions and embeddings.
• Added tests:
  • test_sap_chat_calls.py covers sync/async chat calls and streaming with a fake Gen AI Hub.
  • test_optional_dependency_error.py: ensures missing optional dependency raises a clear error

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12 out of 13 committers have signed the CLA.

✅ krrishdholakia
✅ ishaan-jaff
✅ jlan-nl
✅ hampusnasstrom
✅ ImadSaddik
✅ AlexsanderHamir
✅ dhruvyad
✅ vasilisazayka
✅ huangyafei
✅ mubashir1osmani
✅ kowyo
✅ karimmohraz
❌ Copilot
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