Inject blocks per year and blocks per round to the inflation info

Author: TarekkMA

pallets/parachain-staking/src/inflation.rs

@@ -15,6 +15,7 @@
 // along with Moonbeam.  If not, see <http://www.gnu.org/licenses/>.
 
 //! Helper methods for computing issuance based on inflation
+use std::ops::Div;
 use crate::pallet::{BalanceOf, Config, Pallet};
 use frame_support::traits::Currency;
 use parity_scale_codec::{Decode, Encode, MaxEncodedLen};