Create an admin page and the ability to create a session

[by-gothic]

Create an admin page at the "/admin" route. Access to the page should only be possible if the user has isAdmin set to true. On the admin page, there should be an option to create a new session for a movie using a form and validation.

[by-gothic]

• Creation of the admin component and route "/admin".
• Creation of the session creation form.
• Creation of the API request for session creation in RTK Query.
• Creation of the session creation form using Formik.
• Validation of the form using Yup.
• Display a success message upon successfully creating a session.
• Creation of an admin-protected route to allow access to the admin page only if the isAdmin property is true.
• Creation of a navigation button on the header to navigate to the admin page.
• Reset the form upon successful creation.

~8h