Important

Adds transformation in fetchLLMCompletion.ts to convert system messages to user messages for VertexAI and Anthropic when required.

• Behavior:
  • Adds transformSystemMessageToUserMessage function in fetchLLMCompletion.ts to convert system messages to user messages for providers requiring a user message.
  • Updates fetchLLMCompletion to apply this transformation for VertexAI and Anthropic when only one message is present.
• Constants:
  • Introduces PROVIDERS_WITH_REQUIRED_USER_MESSAGE array to list providers needing a user message.

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