Fix xsd:language-like simple type generations.

[veewee]

Fixes #591

This enhances xsd:language-like type generations from

    /**
     * @var array<int<0,max>, \MyApp\Token>
     */
    private array $elementfilterSprache;

to

    /**
     * @var array<int<0,max>, string>
     */
    private array $elementfilterSprache;

[Copilot]

Pull Request Overview

This PR fixes the type generation for xsd:language-like simple types by ensuring they resolve to their base PHP types (e.g., string) instead of generating unnecessary custom class references.

Key Changes:

• Added logic to detect simple types with known base types and return the base type directly
• Added comprehensive test coverage for various type resolution scenarios

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/Phpro/SoapClient/CodeGenerator/Model/Property.php	Added conditional check to return base type for simple types with known base types
test/PhproTest/SoapClient/Unit/CodeGenerator/Model/PropertyTest.php	Added new test method with data provider covering type resolution for simple types, namespaced types, and root namespace types

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