Add new type of customer that just looks at books

[sweep-ai-deprecated]

Description

This PR adds a new type of customer, LookerCustomer, to the existing customer class. LookerCustomer is a customer who only looks at books without buying or ordering them. The LookerCustomer class inherits from the Customer class and has an additional attribute, a vector of books that the customer has looked at. The interaction method in the LookerCustomer class is overridden to implement the behavior of just looking at books.

The Simulation class has been updated to include LookerCustomers in the simulation. The select_random_data method now generates LookerCustomers along with regular customers. The run method has been modified to handle interactions with LookerCustomers.

Summary

• Created a new class LookerCustomer that inherits from the Customer class.
• Added a new private attribute, a vector of books, to the LookerCustomer class.
• Implemented a public method to add a book to the looked at list in the LookerCustomer class.
• Overrode the interaction method in the LookerCustomer class to implement the behavior of just looking at books.
• Modified the select_random_data method in the Simulation class to generate LookerCustomers for the simulation.
• Updated the run method in the Simulation class to handle interactions with LookerCustomers.

Fixes #4.

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