Expose trait Balance & AssetId (#9863)

* expose trait Balance

* expose trait AssetId

substrate/frame/support/src/traits/tokens.rs

@@ -26,6 +26,6 @@ pub mod nonfungible;
 pub mod nonfungibles;
 pub use imbalance::Imbalance;
 pub use misc::{
-	BalanceConversion, BalanceStatus, DepositConsequence, ExistenceRequirement,
+	AssetId, Balance, BalanceConversion, BalanceStatus, DepositConsequence, ExistenceRequirement,
 	WithdrawConsequence, WithdrawReasons,
 };