validation: pass ChainstateRole for validationinterface calls

This allows consumers to decide how to handle events from background or
assumedvalid chainstates.

src/interfaces/chain.h

@@ -27,6 +27,7 @@ class Coin;
 class uint256;
 enum class MemPoolRemovalReason;
 enum class RBFTransactionState;
+enum class ChainstateRole;
 struct bilingual_str;
 struct CBlockLocator;
 struct FeeCalculation;
@@ -310,10 +311,10 @@ public:
         virtual ~Notifications() {}
         virtual void transactionAddedToMempool(const CTransactionRef& tx) {}
         virtual void transactionRemovedFromMempool(const CTransactionRef& tx, MemPoolRemovalReason reason) {}
-        virtual void blockConnected(const BlockInfo& block) {}
+        virtual void blockConnected(ChainstateRole role, const BlockInfo& block) {}
         virtual void blockDisconnected(const BlockInfo& block) {}
         virtual void updatedBlockTip() {}
-        virtual void chainStateFlushed(const CBlockLocator& locator) {}
+        virtual void chainStateFlushed(ChainstateRole role, const CBlockLocator& locator) {}
     };
 
     //! Register handler for notifications.