[REQ] Add support for documentation cross-referencing

Is your feature request related to a problem? Please describe.

I have a setup where I generate a Python SDK using an OpenAPI specification file. This SDK is also used by other packages and I would like to be able to cross-reference the generated SDK objects in the documentation of those other packages.

My specific use case uses MKDocs and MKDocstrings to automatically generate documentation for my other packages. It has a feature where you can cross reference other projects' inventories. An example below shows how this adds a neat link to the Python str object, using the Python objects.inv file.

Describe the solution you'd like

It would be great if the OpenAPI Generator was also able to automatically generate such an inventory .inv file which could be used to cross-reference in other documentation. This could be added to the docs folder for example.

Describe alternatives you've considered

As far as I know, there is no other way to add cross-referencing using anything generated from the Python generator.

Additional context

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The issue names no repository files or tests. Start by locating the Python generator's documentation output path and understanding how MKDocs/MKDocstrings inventories are consumed; done means generating a usable .inv file that lets external documentation cross-reference the generated SDK objects.