feat: add support for Symfony #[SerializedPath] attribute

[paaneko]

Properties annotated with #[SerializedPath] are now mapped to nested object structures in the generated OpenAPI schema, matching Symfony's serializer behavior.

https://symfony.com/doc/current/serializer.html#deserializing-nested-structures

Description

When a property is annotated with #[SerializedPath('[data][name]')], the generated OpenAPI schema now correctly places it inside a nested data object with a name leaf, instead of exposing it as a flat root-level property.

This covers: nested paths, single-level paths (renames), method-level paths on setters/getters, constructor-properties, interaction with #[Groups], #[Ignore], #[SerializedName], and #[OA\Property] overrides.

What type of PR is this? (check all applicable)

• Bug Fix
• Feature
• Refactor
• Deprecation
• Breaking Change
• Documentation Update
• CI

Checklist

• I have made corresponding changes to the documentation (docs/)

NOTE: This new feature works transparently like #[SerializedName] and #[Groups], which are not documented separately.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.62%. Comparing base (7f69a49) to head (41ef0f7).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##              5.x    #2707      +/-   ##
==========================================
+ Coverage   95.59%   95.62%   +0.02%     
==========================================
  Files          94       94              
  Lines        3064     3083      +19     
==========================================
+ Hits         2929     2948      +19     
  Misses        135      135              

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