module documentation

Temporal-aware AsyncFileSearchStores shim.

TemporalAsyncFileSearchStores is an AsyncFileSearchStores subclass whose upload_to_file_search_store method dispatches through a Temporal activity so the entire upload (including filesystem access and resumable upload negotiation) runs on the activity worker.

Class TemporalAsyncFileSearchStores AsyncFileSearchStores subclass that routes upload_to_file_search_store through an activity.