Make StatusBarView work with hotkeys

- StatusItem can now define a hotkey which is then
  bound to its action.
- In catalog app replace use of raw key event to
  item's hotkey for status bar visibility.
- Various doc updates.
- Relates #826

spring-shell-docs/src/test/java/org/springframework/shell/docs/StatusBarViewSnippets.java

@@ -0,0 +1,63 @@
+/*
+ * Copyright 2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.shell.docs;
+
+import java.util.List;
+
+import org.springframework.shell.component.view.control.StatusBarView;
+import org.springframework.shell.component.view.control.StatusBarView.StatusItem;
+import org.springframework.shell.component.view.event.KeyEvent;
+import org.springframework.shell.component.view.event.KeyEvent.Key;
+
+class StatusBarViewSnippets {
+
+	@SuppressWarnings("unused")
+	void simple() {
+		// tag::simple[]
+		StatusItem item1 = new StatusBarView.StatusItem("Item1");
+		StatusBarView statusBar = new StatusBarView(List.of(item1));
+		// end::simple[]
+	}
+
+	void items() {
+		// tag::items[]
+		StatusItem item1 = StatusBarView.StatusItem.of("Item1");
+
+		Runnable action1 = () -> {};
+		StatusItem item2 = StatusBarView.StatusItem.of("Item2", action1);
+
+		Runnable action2 = () -> {};
+		StatusItem item3 = StatusBarView.StatusItem.of("Item3", action2, KeyEvent.Key.f10);
+
+		StatusBarView statusBar = new StatusBarView();
+		statusBar.setItems(List.of(item1, item2, item3));
+		// end::items[]
+	}
+
+	void viaArray() {
+		// tag::viaarray[]
+		new StatusBarView(new StatusItem[] {
+			StatusItem.of("Item1"),
+			StatusItem.of("Item2")
+				.setAction(() -> {}),
+			StatusItem.of("Item3")
+				.setAction(() -> {})
+				.setHotKey(Key.f10)
+		});
+		// end::viaarray[]
+	}
+
+}