chore: fix circular dependency (#459)

.github/workflows/test.yml

packages/core/jest.config.cjs

packages/core/package.json

packages/core/src/OutputParser.ts

packages/core/src/Prompt.ts

packages/core/src/QueryEngine.ts

packages/core/src/QuestionGenerator.ts

packages/core/src/Tool.ts

packages/core/src/embeddings/OpenAIEmbedding.ts

packages/core/src/embeddings/types.ts

packages/core/src/embeddings/utils.ts

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

packages/core/src/index.ts

packages/core/src/indices/BaseIndex.ts

packages/core/src/indices/keyword/KeywordTableIndex.ts

packages/core/src/indices/summary/SummaryIndex.ts

packages/core/src/indices/vectorStore/VectorStoreIndex.ts

packages/core/src/llm/LLM.ts

packages/core/src/llm/index.ts

packages/core/src/llm/open_ai.ts