[Task] add new module shenyu-sdk. #3925

[huanccwang]

[Task] add new module shenyu-sdk. #3925

ShenyuClient
fallback
fallbackFactory

And I run it with shenyu-examples-sdk-dubbo Successfully.

[codecov-commenter]

Codecov Report

Merging #4200 (0c70661) into master (25fb226) will increase coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #4200   +/-   ##
=========================================
  Coverage     69.64%   69.65%           
  Complexity     7350     7350           
=========================================
  Files           987      987           
  Lines         27783    27783           
  Branches       2466     2466           
=========================================
+ Hits          19349    19351    +2     
+ Misses         6965     6961    -4     
- Partials       1469     1471    +2     

Impacted Files	Coverage Δ
...henyu/common/cache/MemorySafeWindowTinyLFUMap.java	73.33% <0.00%> (-8.34%)	⬇️
...henyu/admin/service/impl/UpstreamCheckService.java	62.66% <0.00%> (-1.34%)	⬇️
...he/shenyu/plugin/grpc/client/ShenyuGrpcClient.java	12.00% <0.00%> (+4.00%)	⬆️
...henyu/plugin/grpc/resolver/ShenyuNameResolver.java	63.82% <0.00%> (+4.25%)	⬆️
...ache/shenyu/plugin/grpc/cache/GrpcClientCache.java	100.00% <0.00%> (+18.75%)	⬆️

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[qicz]

@huanccwang pls check your ci and update your branch