fix: agent callback with step infomation (#774)

packages/core/src/agent/anthropic.ts

packages/core/src/agent/base.ts

packages/core/src/agent/openai.ts

packages/core/src/agent/react.ts

packages/core/src/agent/type.ts

packages/core/src/agent/types.ts

packages/core/src/callbacks/CallbackManager.ts

packages/core/src/embeddings/index.ts

packages/core/src/index.ts

packages/core/src/internal/type.ts