fix: message content type (#696)

examples/jsonExtract.ts

examples/recipes/cost-analysis.ts

packages/core/src/ChatHistory.ts

packages/core/src/agent/openai/worker.ts

packages/core/src/agent/react/types.ts

packages/core/src/agent/react/worker.ts

packages/core/src/engines/chat/ContextChatEngine.ts

packages/core/src/engines/chat/SimpleChatEngine.ts

packages/core/src/evaluation/Correctness.ts

packages/core/src/llm/LLM.ts

packages/core/src/llm/anthropic.ts

packages/core/src/llm/base.ts

packages/core/src/llm/open_ai.ts

packages/core/src/llm/types.ts

packages/core/src/llm/utils.ts

packages/core/src/selectors/llmSelectors.ts

tsconfig.json