Add PubKeyDestination for P2PK scripts

P2PK scripts are not PKHash destinations, they should have their own
type.

This also results in no longer showing a p2pkh address for p2pk outputs.
However for backwards compatibility, ListCoinst will still do this
conversion.

src/rpc/output_script.cpp

@@ -280,6 +280,11 @@ static RPCHelpMan deriveaddresses()
                 for (const CScript& script : scripts) {
                     CTxDestination dest;
                     if (!ExtractDestination(script, dest)) {
+                        // ExtractDestination no longer returns true for P2PK since it doesn't have a corresponding address
+                        // However combo will output P2PK and should just ignore that script
+                        if (scripts.size() > 1 && std::get_if<PubKeyDestination>(&dest)) {
+                            continue;
+                        }
                         throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Descriptor does not have a corresponding address");
                     }