Add intersection type support and fix singularType union parsing

[dereuromark]

Summary

• Fix singularType field to parse union types (was using single-type extraction)
• Add intersection type (&) support to dependency extraction
• Handle parenthesized DNF types like (Foo|Bar)&Baz

Changes

The extractDtoNamesFromType() method now:

1. Removes parentheses for DNF types
2. Splits on both | (union) and & (intersection) operators using preg_split('/[|&]/')

The singularType field now uses extractDtoNamesFromType() (plural) instead of extractDtoNameFromType() (singular), ensuring union types in collection singular types are correctly parsed.

New Tests

Test	Purpose
testSingularTypeWithUnionParsed	Union in singularType detected
testIntersectionTypeCircularDependencyDetected	Foo&Bar intersection detected
testLazyIntersectionTypeBreaksCycle	Lazy intersection skipped
testParenthesizedDnfTypeCircularDependencyDetected	`(Foo
testMixedUnionAndIntersectionTypes	`Foo
testLazySingularTypeUnionBreaksCycle	Lazy singularType union skipped

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.46%. Comparing base (1821437) to head (4b49d11).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #87   +/-   ##
=========================================
  Coverage     83.46%   83.46%           
  Complexity     1386     1386           
=========================================
  Files            40       40           
  Lines          3344     3345    +1     
=========================================
+ Hits           2791     2792    +1     
  Misses          553      553           

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