Changes to List podcasts

added the required property podcast/items/catalog to the response with the 200 status

added the required property podcast/items/podcast_episode/items/last_played to the response with the 200 status

api operation id podcasts was added

added the non-success response with the status 401

added the non-success response with the status 403

added the non-success response with the status 404

added the non-success response with the status 500

added the required property md5 to the response with the 200 status

added the required property podcast to the response with the 200 status

added the required property total_count to the response with the 200 status

added the non-success response with the status 400