fix: add priority property to Task (#330)

(cherry picked from commit a6007d4)

Author: SimonePal

extension/client-java/src/main/java/io/camunda/tasklist/dto/Task.java

@@ -46,6 +46,8 @@ public class Task {
 
   private String tenantId;
 
+  private Integer priority;
+
   private List<Variable> variables;
   private Implementation implementation;
 
@@ -241,6 +243,14 @@ public void setTenantId(String tenantId) {
     this.tenantId = tenantId;
   }
 
+  public Integer getPriority() {
+    return priority;
+  }
+
+  public void setPriority(Integer priority) {
+    this.priority = priority;
+  }
+
   public List<Variable> getVariables() {
     return variables;
   }