Add DuckDB example for R2 Data Catalog

[jonesphillip]

Add DuckDB example for R2 Data Catalog

[hyperlint-ai]

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PR Change Summary

Added an example for using DuckDB with R2 Data Catalog, providing a comprehensive guide for users.

• Introduced a new DuckDB example for connecting to R2 Data Catalog
• Included prerequisites for setting up DuckDB with R2
• Provided example SQL commands for using DuckDB with R2 Data Catalog

Added Files

• src/content/docs/r2/data-catalog/config-examples/duckdb.mdx

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/r2/	@oxyjun, @elithrar, @jonesphillip, @aninibread, @harshil1712, @cloudflare/workers-docs, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://ebd6ef3c.preview.developers.cloudflare.com
Preview Branch URL: https://pjones-r2-data-catalog-duckdb.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/r2/data-catalog/config-examples/duckdb/	https://pjones-r2-data-catalog-duckdb.preview.developers.cloudflare.com/r2/data-catalog/config-examples/duckdb/