[Admin] B.7 Booking Management

[yow-yiying]

• [x] B.7.1 View "Pending Confirmation" bookings (for both vendor and admin-created activities)
• [x] B.7.2 Accept/reject booking (for admin-created activities)
• [x] B.7.3 View "Confirmed" bookings
• [x] B.7.4 Cancel a "Confirmed" booking
• [x] B.7.5 View "Pending Payment" bookings
• [x] B.7.6 Update a "Pending Payment" booking to PAID
• [x] B.7.7 View "Completed and Paid" bookings
• [x] B.7.8 View cancelled booking(s)
• [x] B.7.10 View rejected bookings
• [x] B.7.12 View details of booking