Reply to user comments

[harjotgill]

Summary by OpenAI

New Feature: Users can now reply to specific comments made on the review. This feature improves the user experience by allowing them to address specific issues raised in the review. The changes include updates to .github/workflows/chatgpt-review.yml, src/commenter.ts, src/main.ts, and src/review-comment.ts files to handle pull request review comments.

[github-actions]

🤖 OpenAI

Thank you for letting me participate in the code review.

This pull request adds a new feature of replying to user comments made on the review. It also includes changes to handle pull request review comments, including updating the on event to include pull_request_review_comment, adding constants, and modifying methods to use these constants.

Below is the table of files and their summaries:

File	Summary
.github/workflows/chatgpt-review.yml	Updated on event to include pull_request_review_comment. Added group and cancel-in-progress fields to concurrency.
README.md	Added a new feature of replying to user comments made on the review. Removed the review_comment_lgtm input from the usage example.
src/commenter.ts	Added COMMENT_REPLY_TAG, DESCRIPTION_TAG, DESCRIPTION_TAG_END, and COMMENT_TAG constants. Modified get_description, comment_on_pr, and add_comment_to_line methods to use these constants. Added getConversationChain method to get the conversation chain for a comment.
src/main.ts	Added handleReviewComment function to handle pull request review comments.
src/review-comment.ts	Added handleReviewComment function to handle pull request review comments.

[harjotgill]

Test comment