Add support for target tag retrieval via REST (#1782)

Signed-off-by: Marinov Avgustin <Avgustin.Marinov@bosch.com>

hawkbit-repository/hawkbit-repository-api/src/main/java/org/eclipse/hawkbit/repository/TargetManagement.java

@@ -13,6 +13,7 @@ import java.util.Collection;
 import java.util.List;
 import java.util.Map;
 import java.util.Optional;
+import java.util.Set;
 
 import jakarta.validation.ConstraintViolationException;
 import jakarta.validation.Valid;
@@ -851,6 +852,16 @@ public interface TargetManagement {
     boolean isTargetMatchingQueryAndDSNotAssignedAndCompatibleAndUpdatable(@NotNull String controllerId,
             long distributionSetId, @NotNull String targetFilterQuery);
 
+    /**
+     * Finds a single target tags its id.
+     *
+     * @param controllerId of the {@link Target}
+     * @return the found Tag set
+     * @throws EntityNotFoundException if target with given ID does not exist
+     */
+    @PreAuthorize(SpringEvalExpressions.HAS_AUTH_READ_TARGET)
+    Set<TargetTag> getTagsByControllerId(@NotEmpty String controllerId);
+
     /**
      * Creates a list of target meta data entries.
      *