Optimizing the click sensitivity of dashboard's side bar menu

[cdfive]

Describe what this PR does / why we need it

经测试，控制台左边菜单有不灵敏问题，偶尔出现点击2次才能展开；
复现步骤：
启动控制台，在左边菜单栏点击某个应用，单击中间文字展开，再单击折叠；
然后对准文字右边的向下箭头单击，可能多单击几次，会出现菜单无法展开的情况；
如果有多个应用，点击文字或者箭头展开折叠，多次点击如果点到了箭头也现该情况，
导致主观感觉上有时需要点一下，有时点两下。

Does this pull request fix one issue?

Fixes #245

Describe how you did it

查看sidebar.js的代码，发现里面折叠其它应用菜单的时候，用了element jquery语法，
element.parent().children('ul').hide()
而sidebar.html中向下箭头，相对于菜单文字多了一个层级，如果用parent()加判断不方便；
经向前端同学咨询并查阅了些资料，angular支持数据双向绑定，不推荐直接操作dom；
尝试修改代码，直接遍历修改item.active的值。

参考：
AngularJS折叠菜单实现方法示例 https://www.jb51.net/article/114004.htm
Angular中直接操作DOM https://www.jianshu.com/p/fddd81926e5d

Describe how to verify it

本机启动应用以及在开发、生产环境、按复现步骤多次点击菜单，展开折叠没有出现点两次的情况。

Special notes for reviews

[codecov-io]

Codecov Report

Merging #268 into master will increase coverage by 0.58%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #268      +/-   ##
============================================
+ Coverage     49.83%   50.42%   +0.58%     
- Complexity      915      922       +7     
============================================
  Files           158      158              
  Lines          5259     5259              
  Branches        757      757              
============================================
+ Hits           2621     2652      +31     
+ Misses         2306     2262      -44     
- Partials        332      345      +13

Impacted Files	Coverage Δ	Complexity Δ
...a/csp/sentinel/slots/statistic/base/LeapArray.java	58.57% <0%> (-7.15%)	17% <0%> (-2%)
...a/csp/sentinel/slots/statistic/base/LongAdder.java	31.91% <0%> (+14.89%)	10% <0%> (+6%)	⬆️
...a/csp/sentinel/slots/statistic/base/Striped64.java	56.25% <0%> (+30.2%)	8% <0%> (+3%)	⬆️

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[sczyh30]

LGTM

[sczyh30]

Nice, thanks for contributing! 👍