Return add_pull_request_review_comment tool

[egaponenko-ma]

Describe the feature or problem you’d like to solve

#410 Removed add_pull_request_review_comment (Add a review comment to a pull request or reply to an existing comment) tool, which is legitimate tool that can be used, for example, in case AI is fixing some comments and needs to reply to the exiting comment.

Proposed solution

Return add_pull_request_review_comment tool as standalone