test: add openai agent stream chat (#712)

apps/docs/package.json

examples/package.json

examples/readers/package.json

packages/core/e2e/fixtures/llm/open_ai.ts

packages/core/e2e/node/openai.e2e.ts

packages/core/e2e/node/snapshot/agent.snap

packages/core/e2e/node/snapshot/agent_stream.snap

packages/core/e2e/node/snapshot/gpt-4-turbo.snap

packages/core/e2e/node/snapshot/llm.snap

packages/core/e2e/node/snapshot/queryEngine_subquestion.snap

packages/core/e2e/node/utils.ts

packages/core/e2e/package.json

packages/core/package.json

packages/edge/package.json

packages/env/package.json

packages/experimental/examples/package.json

packages/experimental/package.json

packages/wasm-tools/package.json

pnpm-lock.yaml