Add PHP 8.1 Intersection Types Support for function Return Type

[karyna-tsymbal-atwix]

In PHP 8.1, new Intersection types feature was introduced.
(see details https://wiki.php.net/rfc/pure-intersection-types)

e.g. it's possible to create a function with a signature like
function something(): Foo&Bar&Baz { ...
were return type is an intersection.

Right now Magento will not work properly with such a feature. There are several places where we're using return type's Class (e.g. for code generation):

• https://github.com/magento/magento2/blob/platform-health/lib/internal/Magento/Framework/Async/Code/Generator/ProxyDeferredGenerator.php#L247
• https://github.com/magento/magento2/blob/platform-health/lib/internal/Magento/Framework/Interception/Code/Generator/Interceptor.php#L213
• https://github.com/magento/magento2/blob/platform-health/lib/internal/Magento/Framework/MessageQueue/Code/Generator/RemoteServiceGenerator.php#L158
• https://github.com/magento/magento2/blob/platform-health/lib/internal/Magento/Framework/ObjectManager/Code/Generator/Proxy.php#L288
• https://github.com/magento/magento2/blob/platform-health/lib/internal/Magento/Framework/ObjectManager/Code/Generator/Repository.php#L252
• https://github.com/magento/magento2/blob/platform-health/lib/internal/Magento/Framework/ObjectManager/Code/Generator/Repository.php#L726
• \Magento\Framework\Reflection\Test\Unit\TypeProcessorTest
  (better to re-check in case of other places I missed)

Such places should be adjusted to work properly with intersection types.
The main reason for this adjustments it's because 3rd-party developers may develop some new extensions and declare them to support only php >= 8.1.
in such modules they may use this PHP8.1-feature.

Expected result (*)

Magento should not break when Intersection types are used in the function return type. It should properly generate code and so on.

Actual result (*)

Right now Magento can't handle Intersection types introduced in php 8.1

Related issues:

#34931
#34933

Note: There is a Union type feature that should also be implemented. Need to make sure that 2 people do not work on these features in parallel, as this will lead to a conflict!
#34264

[m2-assistant]

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[m2-assistant]

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[engcom-November]

Hi @karyna-tsymbal-atwix ,
We have gone through the main description and found that this is not related to any bug of Magento but it can be a good feature to have in Magento. Hence marking this ticket as a feature request to process further.
Thank you.