Add commands as list in help templating

- Add getNames method.
- Add docs for templating info and fields to help.
- Fixes #480

spring-shell-standard-commands/src/main/java/org/springframework/shell/standard/commands/CommandInfoModel.java

@@ -15,6 +15,7 @@
  */
 package org.springframework.shell.standard.commands;
 
+import java.util.Arrays;
 import java.util.List;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
@@ -98,6 +99,10 @@ class CommandInfoModel {
 		return name;
 	}
 
+	public List<String> getNames() {
+		return Arrays.asList(name.split(" "));
+	}
+
 	public List<String> getAliases() {
 		return this.aliases;
 	}

spring-shell-standard-commands/src/test/java/org/springframework/shell/standard/commands/CommandInfoModelTests.java

@@ -35,6 +35,28 @@ public class CommandInfoModelTests {
 		assertThat(cim.getName()).isEqualTo("main1");
 	}
 
+	@Test
+	void hasGivenNames() {
+		CommandRegistration r1 = CommandRegistration.builder()
+			.command("main1")
+			.withTarget()
+				.consumer(ctx -> {})
+				.and()
+			.build();
+		CommandInfoModel cim = CommandInfoModel.of("main1", r1);
+		assertThat(cim.getNames()).containsExactly("main1");
+
+		r1 = CommandRegistration.builder()
+			.command("main1 sub1")
+			.withTarget()
+				.consumer(ctx -> {})
+				.and()
+			.build();
+
+		cim = CommandInfoModel.of("main1 sub1", r1);
+		assertThat(cim.getNames()).containsExactly("main1", "sub1");
+	}
+
 	@Test
 	void hasGivenDescription() {
 		CommandRegistration r1 = CommandRegistration.builder()