feat: improve callback manager (#675)

.changeset/nasty-pillows-breathe.md

.cjs.swcrc

.swcrc

apps/docs/docs/recipes/_category_.yml

apps/docs/docs/recipes/cost-analysis.mdx

apps/docs/package.json

examples/multimodal/rag.ts

examples/package.json

examples/qdrantdb/preFilters.ts

examples/readers/package.json

examples/recipes/cost-analysis.ts

package.json

packages/core/src/GlobalsHelper.ts

packages/core/src/Retriever.ts

packages/core/src/ServiceContext.ts

packages/core/src/TextSplitter.ts

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

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

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

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