[ISSUE #4612] init shenyu-plugin-wasm-api module

[loongs-zhang]

Make sure that:

• You have read the contribution guidelines.
• You submit test cases (unit or integration tests) that back your changes.
• Your local test passed ./mvnw clean install -Dmaven.javadoc.skip=true.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ae497d2) 61.35% compared to head (a01d88a) 61.01%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5424      +/-   ##
============================================
- Coverage     61.35%   61.01%   -0.35%     
- Complexity     8640     8643       +3     
============================================
  Files          1253     1258       +5     
  Lines         38145    38372     +227     
  Branches       3655     3670      +15     
============================================
+ Hits          23403    23411       +8     
- Misses        12636    12854     +218     
- Partials       2106     2107       +1     

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