以APP为范围使用LRU和LFU#3159
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What kind of change does this PR introduce? (check at least one)
The description of the PR:
现在的LRU和LFU都是以一个JOB为单位统计的，即使其他JOB（同一个APP内）对某一台执行器地址使用的很频繁，另一个JOB也感知不到。
建议方案：调度中心选择APP的执行器地址时，建立APP范围内的LFU和LRU的统计信息，统计JOB之间的互相使用。
实现方案：每次route地址成功后，都更新LRU和LFU的统计信息，且每个APP都有独立的统计结果。
效果：经单测验证，LRU和LFU可以实现近似均匀分布的效果。
xxl-job-admin/src/test/java/com/xxl/job/admin/core/route/ExecutorRouterHelperTest.java
测试：一个app，地址是两个，分别为191.0.0.1,192.0.0.2，然后建立两个route策略，第一个JOB路由策略是First，运行1000次，第二个JOB路由策略是LFU，运行1000次，地址的统计数据是：
{191.0.0.1=1016, 192.0.0.2=984}
Other information: