feature: init namingserver

[ggbocoder]

• [ ] I have registered the PR changes.

Ⅰ. Describe what this PR did

A Naming Server that provides service registration, service discovery, and service subscription.

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 20.77922% with 122 lines in your changes missing coverage. Please review.

Project coverage is 49.06%. Comparing base (933b492) to head (16b705c). Report is 26 commits behind head on 2.x.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #6537      +/-   ##
============================================
- Coverage     51.13%   49.06%   -2.07%     
- Complexity     5317     5463     +146     
============================================
  Files           950     1023      +73     
  Lines         33448    35440    +1992     
  Branches       4048     4216     +168     
============================================
+ Hits          17103    17389     +286     
- Misses        14666    16372    +1706     
  Partials       1679     1679              

Files	Coverage Δ
...c/main/java/org/apache/seata/common/Constants.java	100.00% <ø> (ø)
...java/org/apache/seata/common/result/BaseParam.java	0.00% <ø> (ø)
...main/java/org/apache/seata/common/result/Code.java	0.00% <ø> (ø)
...ava/org/apache/seata/common/result/PageResult.java	0.00% <ø> (ø)
...in/java/org/apache/seata/common/result/Result.java	0.00% <ø> (ø)
...a/org/apache/seata/common/result/SingleResult.java	0.00% <ø> (ø)
...erver/console/controller/GlobalLockController.java	50.00% <ø> (ø)
...er/console/controller/GlobalSessionController.java	50.00% <ø> (ø)
...er/console/impl/db/BranchSessionDBServiceImpl.java	0.00% <ø> (ø)
...erver/console/impl/db/GlobalLockDBServiceImpl.java	0.00% <ø> (ø)
... and 17 more

... and 98 files with indirect coverage changes