Feature: Add Scheduled Appointment Components

[Irirwanirira]

###What does this PR do?
This PR introduces new screens for managing scheduled appointments within the Medica app, enhancing the appointment management system.

###Description:

• Implemented Cancelled Appointments Screen to display past cancelled appointments.
• Developed Upcoming Appointments Screen allowing users to reschedule or cancel appointments.
• Created Empty Upcoming Appointments Screen to provide guidance when no appointments are scheduled.
• Designed Completed Appointments Screen to showcase past appointments and enable rebooking and reviews.

###Changes Made:

1. Implemented navigation logic for seamless transition between appointment screens.
2. Ensured consistent styling and UI/UX patterns across all appointment screens for a cohesive user experience.

###Screenshots:

Please review this PR and provide feedback. Once approved, it can be merged into the develop branch.