DYN-10011: Return runtime concrete type for types implementing .NET IDisposable - Attempt #2

[aparajit-pratap]

What does this implement/fix? Explain your changes.

Background: When a .NET method returns a concrete type that implements an IDisposable, e.g., in a with statement, Pythonnet incorrectly resolves the object as the interface type instead of the concrete type. This prevents access to the concrete type's members and breaks common patterns using Python's with statement for resource management with IDisposable types.

This PR attempts to fix the above issue.

Does this close any currently open issues?

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Any other comments?

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Checklist

Check all those that are applicable and complete.

• Make sure to include one or more tests for your change
• If an enhancement PR, please create docs and at best an example
• Ensure you have signed the .NET Foundation CLA
• Add yourself to AUTHORS
• Updated the CHANGELOG