For this exercise, you will implement a model and some helper functions that perform tasks similar to the Python Fundamentals "Contacts List" exercise.

To do this, you should make a Contact model with fields for each of these pieces of information:

• name: A string representing the contact's name
• email: A string representing the contact's email address
• phone: A string representing the contact's phone number
• is_favorite: A boolean representing whether or not this contract is a "favorite".

Additionally, you should create each of the following functions.

• app.models.create_contact(name, email, phone, is_favorite) - The user can create an arbitrary amount of contacts.
• app.models.all_contacts() - The user should be able to view all of the contacts at once.
• app.models.find_contact_by_name(name) - The user should be able to search for a contact by name.
• app.models.favorite_contacts() - The user should be able to view the favorite contacts.
• app.models.update_contact_email(name, new_email) - The user should be able to search for a contact by name and update their information.
• app.models.delete_contact(name) - The user should be able to delete contact by name.