Adding auctions to the marketplace

In the MERN Marketplace, we will allow a user who is signed in and has an active seller account to create auctions for items that they want other users to place bids on. To enable the features of adding and managing auctions, we will need to define how to store auction details and implement the full-stack slices that will let users create, access and update auctions on the platform. In the following sections, we will build out this auction module for the application. First, we will define the auction model with a Mongoose Schema for storing details about each auction. Then, we will discuss implementations for the backend APIs and frontend views that are needed to create new auctions, list auctions that are ongoing, created by the same seller and bid on by the same user, and modify existing auctions by either editing details of, or deleting an...