Fix deprecated nullable parameter declarations in PHP 8.2+

[Copilot]

This PR addresses PHP 8.2+ deprecation warnings for implicitly marking parameters as nullable using = null without explicit nullable type declarations.

The issue was occurring in multiple files where parameters had type hints followed by = null default values without the explicit ? nullable prefix or |null union syntax. For example:

// Before (deprecated in PHP 8.2+)
public function __construct(
    array $interceptedProperties,
    ReflectionMethod $constructor = null,
    MethodGenerator $constructorGenerator = null,
    bool $useTypeWidening = false
) {

// After (explicit nullable types)
public function __construct(
    array $interceptedProperties,
    ?ReflectionMethod $constructor = null,
    ?MethodGenerator $constructorGenerator = null,
    bool $useTypeWidening = false
) {

Changes made:

• Simple nullable types: Updated 3 parameters to use the ?Type syntax
• Union nullable types: Updated 13 parameters to use the Type1|Type2|null syntax for union types with null

Files affected:

• src/Proxy/Part/InterceptedConstructorGenerator.php (2 parameters)
• src/Instrument/ClassLoading/CacheWarmer.php (1 parameter)
• All Pointcut classes in src/Aop/Pointcut/ (13 files, 1 parameter each)

The changes maintain full backward compatibility while eliminating deprecation warnings in PHP 8.2+. All syntax has been validated and functionality tested to ensure the fixes don't break existing behavior.

Fixes #510.

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