Improve simulations-related schema

Major schema changes:

1. SimulationDefinitionType was introduced. The system config
now contains a list of these definitions (to be selected from for the
tasks). A task can contain a custom simulation definition as well.

2. SimulationResultType has now start and end timestamps
and its definition.

Other changes:

- Simulation result is closed when the activity finishes: the end
timestamp is recorded and the metric values are computed. (Not working
quite well with distributed and delegated activities for now.)

- Minor code improvements: documenting and renaming things.

gui/admin-gui/src/main/java/com/evolveum/midpoint/gui/impl/page/admin/simulation/PageSimulationResult.java

@@ -11,9 +11,6 @@
 import java.util.List;
 import java.util.stream.Collectors;
 
-import com.evolveum.midpoint.gui.impl.component.data.column.PrismPropertyWrapperColumn;
-import com.evolveum.midpoint.web.component.data.column.LinkColumn;
-
 import com.evolveum.midpoint.web.component.data.column.ObjectNameColumn;
 
 import com.evolveum.midpoint.web.component.util.SelectableBean;
@@ -51,7 +48,7 @@
 import com.evolveum.midpoint.web.page.error.PageError404;
 import com.evolveum.midpoint.web.session.UserProfileStorage;
 import com.evolveum.midpoint.web.util.OnePageParameterEncoder;
-import com.evolveum.midpoint.xml.ns._public.common.common_3.SimulationMetricType;
+import com.evolveum.midpoint.xml.ns._public.common.common_3.SimulationMetricValueType;
 import com.evolveum.midpoint.xml.ns._public.common.common_3.SimulationResultType;
 import com.evolveum.midpoint.xml.ns._public.common.common_3.TagType;
 
@@ -123,11 +120,11 @@ private void initLayout() {
         // todo implement
         IModel<List<SmallBoxData>> data = () -> {
 
-            List<SimulationMetricType> metrics = model.getObject().getMetric();
+            List<SimulationMetricValueType> metrics = model.getObject().getMetric();
             return metrics.stream().map(m -> {
                 SmallBoxData sbd = new SmallBoxData();
                 sbd.setDescription(m.getIdentifier());
-                sbd.setTitle(m.getMatchedObjects().longValue() + "/" + m.getProcessedObjects().longValue());
+                sbd.setTitle(String.valueOf(m.getValue()));
                 sbd.setSmallBoxCssClass("bg-info");
                 sbd.setLinkText("More info");
                 sbd.setIcon("fa fa-database");

infra/schema/src/main/java/com/evolveum/midpoint/schema/merger/simulation/SimulationDefinitionMergeOperation.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2010-2023 Evolveum and contributors
+ *
+ * This work is dual-licensed under the Apache License 2.0
+ * and European Union Public License. See LICENSE file for details.
+ */
+
+package com.evolveum.midpoint.schema.merger.simulation;
+
+import static com.evolveum.midpoint.xml.ns._public.common.common_3.SimulationDefinitionType.F_SUPER;
+
+import java.util.Map;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import com.evolveum.midpoint.schema.merger.BaseMergeOperation;
+import com.evolveum.midpoint.schema.merger.GenericItemMerger;
+import com.evolveum.midpoint.schema.merger.IgnoreSourceItemMerger;
+import com.evolveum.midpoint.schema.merger.OriginMarker;
+import com.evolveum.midpoint.xml.ns._public.common.common_3.SimulationDefinitionType;
+
+/**
+ * Merges {@link SimulationDefinitionType} objects.
+ */
+public class SimulationDefinitionMergeOperation extends BaseMergeOperation<SimulationDefinitionType> {
+
+    public SimulationDefinitionMergeOperation(
+            @NotNull SimulationDefinitionType target,
+            @NotNull SimulationDefinitionType source,
+            @Nullable OriginMarker originMarker) {
+
+        super(target,
+                source,
+                new GenericItemMerger(
+                        originMarker,
+                        createPathMap(Map.of(
+                                F_SUPER, IgnoreSourceItemMerger.INSTANCE
+                        ))));
+    }
+}