Cache pull request review information to avoid duplicates.

• 🆕 Added a new CLI option --no-pull-request-reviews-cache to disable the pull request reviews cache.
• ✨ Introduced handling for the new --no-pull-request-reviews-cache option in the cli.ts and run.ts files.
• 🔄 Renamed the Cache class to JSONLineCache in cache.ts to better reflect its functionality.
• 🛠️ Refactored the githubCreatePullRequestReviews function in github.ts to optionally use the new pullRequestReviewsCache.
• ➕ Added new cache-related constants in constants.ts, including AI_REQUESTS_CACHE, CHAT_CACHE, and GITHUB_PULL_REQUEST_REVIEWS_CACHE.
• 🗃️ Updated githubCreatePullRequestReviews to check for existing cache entries before creating new pull request reviews.
• 🛠️ Modified a string in summarize-link.genai.js to use template literals for consistency.
• 🔄 Updated references from Cache to JSONLineCache in various files (chat.ts, airequesttree.ts, and state.ts) following the class renaming.
• 🧹 Cleaned up and organized the code to integrate the caching mechanism into the pull request review process.

generated by genaiscript pr-describe