Generate recipes-v5.csv for Moderne CLI

[timtebeek]

Summary

Add CSV marketplace support for the Moderne CLI by generating recipes-v5.csv with all available recipes across maven, npm, and pip ecosystems. Includes comprehensive metadata matching the Moderne CLI CSV format specification.

Changes

• RecipesCsvWriter.kt (new): Generates recipes-v5.csv with ecosystem-aware package names, recipe metadata, hierarchical categories with descriptions, options with examples, and data tables with column definitions
• RecipeMarkdownGenerator.kt: Write CSV to both OpenRewrite and Moderne docs output directories
• VersionWriter.kt: Add CSV Installation section to the version documentation with instructions and download link

The CSV includes all recipes (open-source and proprietary) with proper RFC 4180 escaping and structured JSON metadata.

[timtebeek]

Still need to verify the file generated, and placement in rewrite-docs.

[timtebeek]

I'm not quite happy with duplicating the CSV write logic here; I worry that it might turn out to be fragile or wrong, especially if we are to encourage folks to use this format for new CLI installations.

I'd briefly explored whether we could reuse org.openrewrite.marketplace.RecipeMarketplaceWriter#toCsv(org.openrewrite.marketplace.RecipeMarketplace, java.nio.file.Path) here to create the CSV, but that requires a org.openrewrite.marketplace.RecipeMarketplace which we have not adopted here yet, as loading recipes in that way skips some of the details we need, like examples for the docs.

Perhaps we can explore alternatives, like a job that periodically loads all recipes using mod and pushes it's CSV into the docs repo, to avoid this fragile duplication.