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

[loongs-zhang]

Fixes #4612

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

Attention: 77 lines in your changes are missing coverage. Please review.

Comparison is base (814243b) 61.41% compared to head (feb4eeb) 61.33%.

Files	Patch %	Lines
...nyu/plugin/wasm/base/AbstractShenyuWasmPlugin.java	0.00%	36 Missing ⚠️
...org/apache/shenyu/plugin/wasm/base/WasmLoader.java	65.30%	9 Missing and 8 partials ⚠️
...he/shenyu/plugin/wasm/base/AbstractWasmPlugin.java	58.62%	12 Missing ⚠️
...lugin/wasm/base/exception/ShenyuWasmException.java	0.00%	6 Missing ⚠️
...n/wasm/base/exception/ShenyuWasmInitException.java	0.00%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5412      +/-   ##
============================================
- Coverage     61.41%   61.33%   -0.08%     
- Complexity     8617     8629      +12     
============================================
  Files          1248     1253       +5     
  Lines         38018    38144     +126     
  Branches       3647     3655       +8     
============================================
+ Hits          23350    23397      +47     
- Misses        12564    12634      +70     
- Partials       2104     2113       +9     

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