NFT Image URL Changes

Previously, OpenSea had been returning the OpenSea CDN url in NFT responses. One example is the List NFT endpoints which returned the NFT Model which included image_url. Going forward, the image_url field returned when listing NFTs, is deprecated.

Instead, users should call the Get an NFT endpoint to retrieve urls. This response will include both the image_url and animation_url. The value returned will be nearly equivalent to the metadata read on-chain. If the url is an ipfs or arweave file, OpenSea will use one of the public gateways for ease of use.