message: storage-client: remove blocking get_latest_state_root method
  Closes:
  Approved by: zamsden
diff: @@ -304,14 +304,6 @@ pub trait StorageRead: Send + Sync {
  fetch_events: bool,
  ) -> Result<TransactionListWithProof>;
  - /// See [`LibraDB::get_latest_state_root`].
  - ///
  - /// [`LibraDB::get_latest_state_root`]:
  - /// ../libradb/struct.LibraDB.html#method.get_latest_state_root
  - fn get_latest_state_root(&self) -> Result<(Version, HashValue)> {
  - block_on(self.get_latest_state_root_async())
  - }
  -
  /// See [`LibraDB::get_latest_state_root`].
  ///
  /// [`LibraDB::get_latest_state_root`]:
  