add admin page to delete app, cluster and app namespace

[nobodyiam]

No description provided.

[codecov-io]

Codecov Report

Merging #1279 into master will increase coverage by <.01%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master    #1279      +/-   ##
============================================
+ Coverage     48.83%   48.83%   +<.01%     
- Complexity     1725     1726       +1     
============================================
  Files           369      369              
  Lines         10451    10455       +4     
  Branches       1070     1070              
============================================
+ Hits           5104     5106       +2     
- Misses         4969     4971       +2     
  Partials        378      378

Impacted Files	Coverage Δ	Complexity Δ
.../apollo/portal/controller/NamespaceController.java	3.84% <0%> (-0.41%)	2 <0> (ø)
...mework/apollo/portal/service/NamespaceService.java	69.84% <0%> (+1.09%)	26 <0> (+1)	⬆️
...rk/apollo/portal/controller/ClusterController.java	8.33% <0%> (-0.76%)	1 <0> (ø)
...ervice/service/ReleaseMessageServiceWithCache.java	85.71% <0%> (-1.2%)	24% <0%> (-1%)
...lo/configservice/util/InstanceConfigAuditUtil.java	70.17% <0%> (-0.88%)	13% <0%> (-1%)
.../apollo/internals/RemoteConfigLongPollService.java	76.68% <0%> (-0.62%)	27% <0%> (ø)
...work/apollo/biz/message/DatabaseMessageSender.java	66.66% <0%> (+10.41%)	8% <0%> (+2%)	⬆️

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