split FileVisitor::handleClassNode into handleClassNode and handleAnonClassNode

[micheleorselli]

This will fix #498. A small improved was also added: anonymous classes extends is now collected as dependency

[sonarqubecloud]

Quality Gate failed

Failed conditions
57.4% Duplication on New Code (required ≤ 3%)

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.30%. Comparing base (89bfe5f) to head (49a893d).

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #511      +/-   ##
============================================
+ Coverage     97.28%   97.30%   +0.01%     
- Complexity      628      629       +1     
============================================
  Files            80       80              
  Lines          1769     1780      +11     
============================================
+ Hits           1721     1732      +11     
  Misses           48       48              

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