Pass the latest active key to the Block's scan function

Effectively necessary for networks on which we utilize account abstraction in
order to know what key to associate the received coins with.

processor/primitives/src/block.rs

@@ -43,7 +43,11 @@ pub trait Block: Send + Sync + Sized + Clone + Debug {
   /// Scan all outputs within this block to find the outputs spendable by this key.
   ///
   /// No assumption on the order of the returned outputs is made.
-  fn scan_for_outputs_unordered(&self, key: Self::Key) -> Vec<Self::Output>;
+  fn scan_for_outputs_unordered(
+    &self,
+    latest_active_key: Self::Key,
+    key: Self::Key,
+  ) -> Vec<Self::Output>;
 
   /// Check if this block resolved any Eventualities.
   ///