Adds a new agent SKILL for developing new I/O connectors

[chamikaramj]

Covers basic instructions for developing new sources and sinks and scrutinizes several cases that can lead to bugs.

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a detailed guide for developers to build new Apache Beam I/O connectors. It standardizes the development process by providing best practices for module structure, transform implementation, and cross-language integration, ensuring new connectors are robust, schema-aware, and easily accessible across different SDKs.

Highlights

• New I/O Connector Development Guide: Added a comprehensive guide for developing new Apache Beam I/O connectors, covering module structure, Gradle configuration, and implementation patterns.
• Modern Best Practices: Outlined requirements for schema-aware connectors, cross-language support via the Expansion Service, and integration with the Managed I/O API.
• Documentation Updates: Updated existing I/O connector documentation to include a reference link to the new development guide.

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Code Review

This pull request introduces a comprehensive guide on developing new Apache Beam I/O connectors and adds a reference link to the existing I/O connectors skill documentation. The review feedback highlights two necessary improvements in the new guide: correcting an invalid website directory path to a relative repository path, and replacing local file:/// URLs for reference implementations with public GitHub links.

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[damccorm]

Thanks!

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[chamikaramj]

Thanks!