BAEL-5630: Spring Boot 3 Sample (#12449)

* BAEL-5630: Spring Boot 3 Sample

* BAEL-5630: Reorganize project in Maven profiles

* BAEL-5630: Upgrade Maven PMD plugin version

* BAEL-5630: Rename tests to follow naming conventions

spring-boot-modules/spring-boot-3/src/main/java/com/baeldung/sample/TodoApplication.java

@@ -0,0 +1,11 @@
+package com.baeldung.sample;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+@SpringBootApplication
+public class TodoApplication {
+    public static void main(String[] args) {
+        SpringApplication.run(TodoApplication.class, args);
+    }
+
+}