feat: rename bundlr to irys

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What does this PR do?

🤖 Generated by Copilot at f24a875

This pull request replaces the bundlr package with the irys package for creating and processing bundles and metadata on Arweave. It renames and refactors the files and variables related to the bundlr package and updates the documentation accordingly. It also adds the integration with Irys, a tool for creating metadata on Arweave.

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 f24a875

• Rename the bundlr package to irys and update the name field in the package.json file (link, link, link, link, link, link)
• Replace the package name bundlr with irys in the README.md files of the packages and workers folders (link, link)
• Update the metadata worker to use the irys package instead of the bundlr package and the IRYS_PRIVATE_KEY environment variable instead of the BUNDLR_PRIVATE_KEY one (link, link, link, link, link, link, link, link, link, link, link, link, link)
• Update the bootstrap script to generate and insert the IRYS_PRIVATE_KEY variable into the .dev.vars file (link)

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