fix: setDocumentHash should be async (#868)

.changeset/twelve-bottles-wait.md

...gin-content-docs/current/api/classes/BaseDocumentStore.md

...gin-content-docs/current/api/classes/BaseDocumentStore.md

...gin-content-docs/current/api/classes/BaseDocumentStore.md

packages/core/src/indices/BaseIndex.ts

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

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

packages/core/src/ingestion/strategies/DuplicatesStrategy.ts

packages/core/src/storage/docStore/types.ts