Fetch Babe configuration from runtime state (#11760)

* Fetch babe config data from runtime state

* Some renaming

* More renaming

* Final nits

* Fix tests and benches

* Rename  to  in BabeConfiguration

* Remove duplicate babe parameter description

Already specified over the 'PRIMARY_PROBABILITY' constant value

* trigger pipeline

* trigger pipeline

substrate/frame/babe/src/lib.rs

@@ -306,6 +306,7 @@ pub mod pallet {
 	/// The configuration for the current epoch. Should never be `None` as it is initialized in
 	/// genesis.
 	#[pallet::storage]
+	#[pallet::getter(fn epoch_config)]
 	pub(super) type EpochConfig<T> = StorageValue<_, BabeEpochConfiguration>;
 
 	/// The configuration for the next epoch, `None` if the config will not change