SLING-8473 Provide Sling CMS features

add features for CMS author, renderer and standalone
diff --git a/pom.xml b/pom.xml
index 505b940..47fcca6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -168,6 +168,9 @@
             <feature>sling-cms</feature>
             <feature>sling-cms-login</feature>
             <feature>sling-cms-reference</feature>
+            <feature>sling-cms-author</feature>
+            <feature>sling-cms-renderer</feature>
+            <feature>sling-cms-standalone</feature>
             <!-- Composum -->
             <feature>composum-nodes</feature>
             <!-- Thymeleaf -->