Add: GitHub alert aggregator + optimized message format + GitHub tool for sre assistant

[schobele]

This pull request introduces several enhancements and new features to the src/aggregator module, focusing on integrating GitHub context aggregation, improving error handling, and updating the context analysis process. The most important changes include adding a new GitHub aggregator, updating the context analysis prompts, and modifying the structure of job logs.

GitHub Aggregation Integration:

• Added a new githubAggregator to fetch context from GitHub repositories, including recent commits, pull requests, and releases. (src/aggregator/ContextAggregator.ts, src/aggregator/github-aggregator.ts, src/aggregator/github-aggregator.spec.ts) [1] [2] [3] [4]

Context Analysis Improvements:

• Updated the context analysis prompts to provide more detailed and structured information, including a new format for presenting context and guidelines for generating summaries. (src/aggregator/chains.ts) [1] [2]

Error Handling Enhancements:

• Improved error handling in the aggregate method of CheckContextAggregator to log errors and return an empty array if context fetching fails. (src/aggregator/ContextAggregator.ts)

Job Log Structure Update:

• Modified the structure of jobLog in ErrorMessage to separate logs into setup, request, and teardown phases. (src/checkly/models.ts) [1] [2]

Miscellaneous Updates:

• Updated test data in checkly-aggregator.spec.ts to reflect new check names and IDs. (src/aggregator/checkly-aggregator.spec.ts)
• Added a name property and logging to the checklyAggregator for better traceability. (src/aggregator/checkly-aggregator.ts)

These changes collectively enhance the functionality and robustness of the context aggregation and analysis processes, particularly with the integration of GitHub data.