Description

This PR should fix the issues with Ray and Python > 3.8

Ray uses the inspect module it its process to convert a class into a remote object to inspect the methods. If the class has methods ( in particular getitems_) that return a GenericAlias object, the inspect.signature(...) will throw an error. It is explained very well here: ray-project/ray#43117.

Therefore, I assume the long term fix should come from the inspect module.

However, since at least for our collectors the only problematic methods was indeed _getitems__, we can just declared it and not return a GenericAlias object.

Motivation and Context

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You can use the syntax close #15213 if this solves the issue #15213

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