[AB-70] adding concept of command parameter validators and applied them at various places, this has the intention for commands to fail early

removing duplicated command for assignable role places

abstracto-application/coverage/pom.xml

@@ -71,6 +71,12 @@
             <groupId>dev.sheldan.abstracto.core</groupId>
             <artifactId>core-impl</artifactId>
         </dependency>
+
+        <dependency>
+            <groupId>dev.sheldan.abstracto.core</groupId>
+            <artifactId>core-interface</artifactId>
+            <version>${project.version}</version>
+        </dependency>
     </dependencies>
 
     <build>