Enable specifying target type when created using DMF API (#1472)

Extension of DMF API with possibility of setting target
type name when creating target. If a target type with the
provided name is found (was created beforehand) then it
is associated with the new target.

Signed-off-by: Ondrej Charvat <ondrej.charvat@proton.me>

hawkbit-dmf/hawkbit-dmf-api/src/main/java/org/eclipse/hawkbit/dmf/json/model/DmfCreateThing.java

@@ -24,6 +24,9 @@ public class DmfCreateThing {
     @JsonProperty
     private String name;
 
+    @JsonProperty
+    private String type;
+
     @JsonProperty
     private DmfAttributeUpdate attributeUpdate;
 
@@ -35,6 +38,14 @@ public class DmfCreateThing {
         this.name = name;
     }
 
+    public String getType() {
+        return type;
+    }
+
+    public void setType(final String type) {
+        this.type = type;
+    }
+
     public DmfAttributeUpdate getAttributeUpdate() {
         return attributeUpdate;
     }