Download content exclusions from GitHub

[dividedmind]

This pull request introduces a new feature to download and manage content exclusions from GitHub. The key changes include adding new utility functions for handling exclusions, modifying the chat completion service to ensure exclusions are downloaded, and adding tests for the new functionality.

vscode-gh-exclusion.mp4

New functionality for handling exclusions:

• src/lib/exclusionUtils.ts: Added functions to download content exclusions (downloadContentExclusions), ensure exclusions are downloaded (ensureExclusionsDownloaded), and attempt to download exclusions (tryDownloadingExclusions). Also added functions to get GitHub tokens and handle errors during exclusion downloads.

• src/lib/fetchGHExclusions.ts: Added a new module to fetch content exclusions from GitHub, including the fetchGHExclusions function and related types (GitHubContentExclusion, Rule, Scope).

Modifications to chat completion service:

• src/services/chatCompletion.ts: Updated the ChatCompletion class to try downloading exclusions during initialization and ensure exclusions are downloaded before handling requests. [1] [2] [3]

Tests for new functionality:

• test/unit/lib/fetchGHExclusions.test.ts: Added unit tests for the fetchGHExclusions function to verify successful fetching, handling of 404 responses, and error handling for other response statuses.

Dependency updates:

• package.json: Removed the @appland/appmap dependency and cleaned up the resolutions section. [1] [2]