Introduce new command DSL

Signed-off-by: Piotr Olaszewski <piotr.olaszewski@thulium.pl>

Author: piotrooo

spring-shell-autoconfigure/src/main/java/org/springframework/shell/boot/CommandRegistryAutoConfiguration.java

@@ -71,11 +71,10 @@ public CommandRegistrationCustomizer helpOptionsCommandRegistrationCustomizer(Sp
 		return registration -> {
 			Help help = properties.getHelp();
 			if (help.isEnabled()) {
-				registration.withHelpOptions()
-					.enabled(true)
+				registration.withHelpOptions(helpOptionsSpec -> helpOptionsSpec.enabled(true)
 					.longNames(help.getLongNames())
 					.shortNames(help.getShortNames())
-					.command(help.getCommand());
+					.command(help.getCommand()));
 			}
 		};
 	}

spring-shell-autoconfigure/src/test/java/org/springframework/shell/boot/CommandRegistryAutoConfigurationTests.java

@@ -165,9 +165,7 @@ static class CustomCommandRegistrationConfiguration {
 		CommandRegistration commandRegistration() {
 			return CommandRegistration.builder()
 				.command("customcommand")
-				.withTarget()
-				.function(ctx -> null)
-				.and()
+				.withTarget(targetSpec -> targetSpec.function(ctx -> null))
 				.build();
 		}