feat: decouple openai from `llamaindex` module (#1194)

.changeset/early-crabs-nail.md

.github/workflows/test.yml

...ges/llamaindex/e2e/fixtures/embeddings/OpenAIEmbedding.ts

packages/llamaindex/e2e/fixtures/llm/openai.ts

packages/llamaindex/e2e/mock-module.js

packages/llamaindex/e2e/package.json

packages/llamaindex/package.json

packages/llamaindex/src/ChatHistory.ts

packages/llamaindex/src/QuestionGenerator.ts

packages/llamaindex/src/ServiceContext.ts

packages/llamaindex/src/Settings.ts

packages/llamaindex/src/agent/openai.ts

packages/llamaindex/src/cloud/LlamaCloudIndex.ts

packages/llamaindex/src/cloud/config.ts

packages/llamaindex/src/embeddings/OpenAIEmbedding.ts

packages/llamaindex/src/embeddings/fireworks.ts

packages/llamaindex/src/embeddings/together.ts

packages/llamaindex/src/extractors/MetadataExtractors.ts

packages/llamaindex/src/internal/settings/EmbedModel.ts

packages/llamaindex/src/llm/deepinfra.ts