[ISSUE dubbo#11900] part4 init dubbo-wasm-registry-api module

[loongs-zhang]

What is the purpose of the change

This PR also refactor test, now the tests of rust part are all in dubbo-wasm/dubbo-wasm-test module.

see apache/dubbo#11900

Verifying this change

see dubbo-wasm/dubbo-wasm-registry-api/src/test

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (efd18a6) 25.17% compared to head (92c9d2f) 26.08%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #285      +/-   ##
============================================
+ Coverage     25.17%   26.08%   +0.90%     
- Complexity     1007     1057      +50     
============================================
  Files           285      292       +7     
  Lines         13154    13401     +247     
  Branches       1703     1702       -1     
============================================
+ Hits           3312     3496     +184     
- Misses         9504     9568      +64     
+ Partials        338      337       -1     

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[songxiaosheng]

LGTM