feat: add ipinfo worker

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What does this PR do?

🤖 Generated by Copilot at 85a6e6b

This pull request adds a new worker package called ipinfo that returns some information about the IP address of the requestor. The package consists of a README.md file, a source code file in TypeScript, and a configuration file for Wrangler.

Related issues

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (non-breaking small changes to existing functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Explanation of the changes

🤖 Generated by Copilot at 85a6e6b

• Add a new ipinfo worker package that returns some information about the IP address of the requestor (link, link, link)
• Create a README.md file with a title that describes the worker (packages/workers/ipinfo/README.md) (link)
• Write the source code of the worker in a handleRequest function that extracts and returns the IP address, country code, and ray ID from the request headers (packages/workers/ipinfo/src/index.ts) (link)
• Export a default object with a fetch method that invokes the handleRequest function as the entry point for the worker script (link)
• Configure the worker name, main file, compatibility date, and routes in a wrangler.toml file (packages/workers/ipinfo/wrangler.toml) (link)
• Include a custom domain for the worker in the routes (link)

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