[Optimize] CacheStore-API, Framework-API, Event, Common 补充多个单元测试类的文档注释;

[Optimize] CacheKeyTest, CollectionUtilsTest, EventUtilsTest, FactoryInfoTest 在类文档添加测试所针对的类;

ContentGrabbingJi-CacheStore-api/src/test/java/net/lamgc/cgj/bot/cache/CacheKeyTest.java

@@ -20,6 +20,9 @@ package net.lamgc.cgj.bot.cache;
 import org.junit.Assert;
 import org.junit.Test;
 
+/**
+ * @see CacheKey
+ */
 public class CacheKeyTest {
 
     @Test