Add http debug feature

[doublnt]

Add request header

Add user agent config test

Update http debug output message

Update HttpDebugTest

Remove this test to new branch

Remove unused using of test

Add http debug 500 test

You need to complete

• [ ] unit tests and/or feature tests
• [ ] documentation is changed or added

[codecov-io]

Codecov Report

Merging #136 into master will increase coverage by 0.87%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #136      +/-   ##
==========================================
+ Coverage   96.65%   97.53%   +0.87%     
==========================================
  Files          53       53              
  Lines        2573     2597      +24     
  Branches      237      239       +2     
==========================================
+ Hits         2487     2533      +46     
+ Misses         58       37      -21     
+ Partials       28       27       -1

Impacted Files	Coverage Δ
aliyun-net-sdk-core/Utils/DictionaryUtil.cs	100% <100%> (ø)	:arrow_up:
aliyun-net-sdk-core/DefaultAcsClient.cs	85.84% <100%> (+3.17%)	:arrow_up:
...dk-core/Auth/InstanceProfileCredentialsProvider.cs	97.22% <0%> (-2.78%)	:arrow_down:
aliyun-net-sdk-core/Profile/DefaultProfile.cs	94.09% <0%> (+1.36%)	:arrow_up:
aliyun-net-sdk-core/Http/HttpResponse.cs	95.76% <0%> (+5.08%)	:arrow_up:
...et-sdk-core/Regions/DescribeEndpointServiceImpl.cs	100% <0%> (+13.51%)	:arrow_up:

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[doublnt]

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