Changes to Compose Media

added the new optional query request parameter tier

added the non-success response with the status 403

added backgroundRemoval discriminator mapping keys to the elements/items/transformers/items request property (media type: application/json)

added backgroundRemoval discriminator mapping keys to the elements/items/transformers/items request property (media type: text/json)

added backgroundRemoval discriminator mapping keys to the elements/items/transformers/items request property (media type: application/*+json)

added the new webp enum value to the request property output/container (media type: application/json)

added the new webp enum value to the request property output/container (media type: text/json)

added the new webp enum value to the request property output/container (media type: application/*+json)

endpoint added