Feature: `/start_exam_review`, `/stop_exam_review`, and google sheet integration about yet-another-better-office-hour-bot

[tomli380576]

Might be easier to split this into a dedicated /start_exam_review and /stop_exam_review

[tomli380576]

actually don't override the entire queue display
add another embed titled Ongoing Review Sessions

[tomli380576]

Current Proposal (Updated Oct 18)

Steps	Helper	Student	YABOB
1	Schedule the Zoom meeting and obtains the meeting link
2	Use /start_exam_review queue=<QueueName>, enter the meeting link and a title into the modal		Re-render Queue with an extra Exam Review embed after modal submit
3	(Optional) Announce to the students		Creates a new server event "<Review Session Title>", posts the link in the corresponding queue chat.
4		Tries to Join the queue with /enqueue or [JOIN]	Handles [JOIN] normally - If [JOIN] is used for the queue with an ongoing review, also prompt the student that there's a review going on and show them the link
5	Holds the review with recording enabled
6	Click Stop Recording on zoom, go to https://ucdavis.zoom.us/recording and gets the recording link - The link will be available even if the recording is still uploading
7	Use /stop_exam_review and enter the recording link into the modal		Records the review link after modal submit
8			Emit onExamReviewStop and let the google sheets extension collect attendance

[tomli380576]

Potential Implementation Issues (Updated Oct 18)

1. There might be a significant change to the Helper type because there's no Helpee to go into the helpedStudents array. Unless we force the students to use JOIN before they go to the review session.

• Possible Solution: Just make a separate ExamReviewSessionEntry

2. HelpSessionEntry and AttendanceEntry types have to adapt to review sessions

[tomli380576]

May require individual google sheets per server

[KaoushikMurugan]

May no longer need this to be implemented since CS Tutoring will be removing review sessions as a requirement. Instead we could generalize this to having support for discord stages. Review sessions on discord can be handled similarly to #175