refactor: move storage into core (#1451)

.changeset/mighty-clocks-share.md

packages/core/package.json

packages/core/src/data-structs/data-structs.ts

packages/core/src/data-structs/index.ts

packages/core/src/data-structs/json-to-index-struct.ts

packages/core/src/query-engine/retriever.ts

packages/core/src/schema/index.ts

packages/core/src/schema/type.ts

packages/core/src/storage/doc-store/index.ts

packages/core/src/storage/index-store/index.ts

packages/core/src/storage/kv-store/index.ts

packages/core/storage/doc-store/package.json

packages/core/storage/index-store/package.json

packages/core/storage/kv-store/package.json

packages/llamaindex/src/index.edge.ts

packages/llamaindex/src/indices/BaseIndex.ts

packages/llamaindex/src/indices/IndexStruct.ts

packages/llamaindex/src/indices/index.ts

packages/llamaindex/src/indices/json-to-index-struct.ts

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