Add tutorial for import CSV into D1

[rickyrobinett]

Summary

This adds a tutorial for importing a CSV into D1. Something I needed to do today, so I captured the process I went through. Please feel free to poke holes or call out if there's a better way.

Documentation checklist

• [ X ] The documentation style guide has been adhered to.

[hyperlint-ai]

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PR Change Summary

Added a tutorial for importing a CSV file into D1 using the Wrangler CLI, providing step-by-step instructions for users.

• Introduced a new tutorial for importing CSV files into D1.
• Outlined prerequisites and installation steps for Wrangler.
• Provided detailed instructions for converting CSV to SQL and importing into D1.

Added Files

• src/content/docs/d1/tutorials/import-to-d1-from-csv/index.mdx

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[rickyrobinett]

@elithrar @vy-ton would especially love for you all to poke holes in this

[kodster28]

This has been sitting around for a while and - unfortunately - we haven't gotten PM to prioritize it.

Going to close out for now, but happy to re-open if we can get other eyes on it!