fix: preFilters doesnot work with asQueryEngine (#1298)

.changeset/tame-squids-clean.md

examples/metadata-filter/preFilters.ts

examples/vectorIndexCustomize.ts

examples/vectorIndexFromVectorStore.ts

packages/llamaindex/src/cloud/LlamaCloudIndex.ts

...ages/llamaindex/src/engines/query/RetrieverQueryEngine.ts

packages/llamaindex/src/indices/keyword/index.ts

packages/llamaindex/src/indices/summary/index.ts

packages/llamaindex/src/indices/vectorStore/index.ts