Issue 1111-核心阻塞队列枚举 BlockingQueueTypeEnum.createBlockingQueue(String blockingQueueName, Integer capacity)抛出NPE问题修复 (#1117)

* fix the NPE about null Integer convert to int,change temCapacity's type from int to Integer

* refactor BlockingQueueTypeEnum

hippo4j-common/src/main/java/cn/hippo4j/common/executor/support/BlockingQueueTypeEnum.java

@@ -234,11 +234,11 @@ public enum BlockingQueueTypeEnum {
                 .map(each -> each.generateBlockingQueue())
                 .findFirst()
                 .orElseGet(() -> {
-                    int temCapacity = capacity;
+                    Integer tempCapacity = capacity;
                     if (capacity == null || capacity <= 0) {
-                        temCapacity = DEFAULT_CAPACITY;
+                        tempCapacity = DEFAULT_CAPACITY;
                     }
-                    return new LinkedBlockingQueue<T>(temCapacity);
+                    return new LinkedBlockingQueue<T>(tempCapacity);
                 });
     }