feat: Add support for processing inner classes in API export

[tangcent]

fix #1255

[github-actions]

📦 Plugin has been packaged for this PR. You can download easy-yapi-2.8.2.212.0.zip from the GitHub Actions workflow run by clicking on the "Artifacts" dropdown.

[github-actions]

📦 Plugin has been packaged for this PR. You can download easy-yapi-2.8.2.212.0.zip from the GitHub Actions workflow run by clicking on the "Artifacts" dropdown.

[github-actions]

📦 Plugin has been packaged for this PR. You can download easy-yapi-2.8.2.212.0.zip from the GitHub Actions workflow run by clicking on the "Artifacts" dropdown.

[github-actions]

📦 Plugin has been packaged for this PR. You can download easy-yapi-2.8.2.212.0.zip from the GitHub Actions workflow run by clicking on the "Artifacts" dropdown.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.682%. Comparing base (af26ff0) to head (17a9423).
Report is 1 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff               @@
##              master     #1258       +/-   ##
===============================================
- Coverage     54.749%   54.682%   -0.067%     
+ Complexity      2782      2779        -3     
===============================================
  Files            289       289               
  Lines          16614     16616        +2     
  Branches        3709      3710        +1     
===============================================
- Hits            9096      9086       -10     
- Misses          5812      5825       +13     
+ Partials        1706      1705        -1     

Flag	Coverage Δ
unittests	54.682% <100.000%> (-0.067%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...tangcent/idea/plugin/api/ClassApiExporterHelper.kt	66.372% <100.000%> (+0.606%)	⬆️

... and 1 file with indirect coverage changes

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