Tool to compare public API surface with Lucene

[paulirwin]

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Task description

We should create a tool that compares the public API surface of Lucene (at a specified version) to Lucene.NET. See #1018 (comment) for context.

ChatGPT suggested comparing the metadata generated by Docfx and javadoc. Another alternative might be creating a Java tool to export JSON or XML of the public API surface via reflection, and then create a .NET tool that compares that via .NET reflection to Lucene.NET's assemblies.

This will require mapping Java naming conventions to .NET, amongst other challenges. We'd likely need the ability to create a manual mapping/exclusions file to handle discrepancies. But this will help us confirm the public API of Lucene.NET matches Lucene, as well as aid future porting efforts.