Changes to List hireable agents [public]

added the new optional query request parameter requires

added the optional property agents/items/default_model to the response with the 200 status

added the optional property agents/items/installed to the response with the 200 status

added the optional property agents/items/stats/usage to the response with the 200 status

added the optional property error/request_id to the response with the default status

added the required property agents/items/conformance to the response with the 200 status

added the required property agents/items/seller to the response with the 200 status