feat: Introduce agent skills for various Apache Beam developments

[liferoad]

following https://antigravity.google/docs/skills, use LLM to create a set of skills as the base. We can keep improving them.

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Summary of Changes

Hello @liferoad, 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 foundational framework for agent skills within the Apache Beam repository. It establishes a dedicated structure for defining knowledge modules in markdown, which are intended to be consumed by an automated agent. The initial set of skills comprehensively covers key development areas, from fundamental concepts and build processes to specific SDK development and runner configurations. This initiative aims to centralize and standardize operational knowledge, making it more accessible and actionable for automated assistance and improving overall developer efficiency.

Highlights

• Introduction of Agent Skills Framework: A new directory, '.agent/skills', has been added to house markdown-based skill definitions for an automated agent. This framework is designed to provide structured knowledge for the agent to perform specialized tasks within the Apache Beam codebase.
• Comprehensive Initial Skill Set: Eight detailed skill documents have been introduced, covering critical aspects of Apache Beam development: core concepts, CI/CD processes, contribution guidelines, Gradle build system, I/O connectors, Java SDK development, Python SDK development, and various pipeline runners.
• Standardized Skill Structure: Each skill is defined in a 'SKILL.md' file within its own folder, featuring YAML frontmatter for metadata (name, description) and detailed markdown content for instructions. A 'README.md' in the root skills directory explains the discovery, activation, and execution process for these skills.
• Enhanced Developer Experience: The new skills provide in-depth guides, code examples, and troubleshooting tips for common development scenarios across different Beam components and languages, aiming to streamline development and onboarding for contributors.

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R: @chamikaramj added as fallback since no labels match configuration

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[damccorm]

Generally lgtm, just had a few comments

[damccorm]

Could you link to http://antigravity.google/docs/skills ?

[damccorm]

This doesn't work anymore

[damccorm]

We should recommend trigger files, not phrases - https://github.com/apache/beam/tree/112685de58d7b24b70b8d8eb7171f0e28b35a2f1/.github/workflows#running-workflows-manually

[damccorm]

Same thing here