Call all LLM APIs using the OpenAI format [Bedrock, Huggingface,
VertexAI, TogetherAI, Azure, OpenAI, etc.]

LiteLLM manages:
- Translate inputs to provider's completion, embedding, and
  image_generation endpoints
- Consistent output, text responses will always be available at
  ['choices'][0]['message']['content']
- Retry/fallback logic across multiple deployments (e.g. Azure/OpenAI)
  - Router
- Track spend & set budgets per project OpenAI Proxy Server