[BAEL-16662] Move articles out of spring-core and into spring-di and … (#7750)

* [BAEL-16662] Move articles out of spring-core and into spring-di and spring-core-2

* [BAEL-16662] Fixed required config classes

* [BAEL-16662] - Removed unused dependencies from spring-core

spring-di/src/main/java/com/baeldung/sample/Formatter.java

@@ -0,0 +1,7 @@
+package com.baeldung.sample;
+
+public interface Formatter {
+
+    String format();
+
+}