message: Wire-up `NetRequest::ApprovalsHashes`
diff: @@ -740,8 +740,18 @@ impl Storage {
  fetch_response,
  )?)
  }
  - // TODO
  - NetRequest::ApprovalsHashes(_) => todo!(),
  + NetRequest::ApprovalsHashes(ref serialized_id) => {
  + let item_id = decode_item_id::<ApprovalsHashes>(serialized_id)?;
  + let opt_item = self.read_approvals_hashes(&item_id)?;
  + let fetch_response = FetchResponse::from_opt(item_id, opt_item);
  +
  + Ok(self.update_pool_and_send(
  + effect_builder,
  + incoming.sender,
  + serialized_id,
  + fetch_response,
  + )?)
  + }
  }
  }
  