BAEL-3732: Move core-java-security-manager into core-java-security (#8460)

* BAEL-3732: Move core-java-security-manager into core-java-security

* BAEL-3732: Teardown the security manager to not interfere with other tests

core-java-modules/core-java-security/src/main/java/com/baeldung/securitymanager/CustomPermission.java

@@ -0,0 +1,13 @@
+package com.baeldung.securitymanager;
+
+import java.security.BasicPermission;
+
+public class CustomPermission extends BasicPermission {
+    public CustomPermission(String name) {
+        super(name);
+    }
+
+    public CustomPermission(String name, String actions) {
+        super(name, actions);
+    }
+}

core-java-modules/core-java-security/src/main/java/com/baeldung/securitymanager/Service.java

@@ -0,0 +1,18 @@
+package com.baeldung.securitymanager;
+
+public class Service {
+
+    public static final String OPERATION = "my-operation";
+
+    public void operation() {
+        SecurityManager securityManager = System.getSecurityManager();
+        if (securityManager != null) {
+            securityManager.checkPermission(new CustomPermission(OPERATION));
+        }
+        System.out.println("Operation is executed");
+    }
+
+    public static void main(String[] args) {
+        new Service().operation();
+    }
+}