Icu 8190 ember data recording asciicast (#124)

* feat: 🎸 Add asciicast getter and adapter

✅ Closes: ICU-8190

addons/api/addon/models/session-recording.js

@@ -28,17 +28,25 @@ export default class SessionRecordingModel extends GeneratedSessionRecordingMode
     return !TYPES_SESSION_RECORDING.includes(this.type);
   }
 
-  getAsciiCast({ connectionId, channelId, mimeType }) {
+  /**
+   * Download the recording for either session, connection, or channels.
+   * id can be the session ID, session recording ID, connection recording ID,
+   * or the channel recording ID.
+   * @param {string} id
+   * @param {string} mimeType
+   * @returns {Promise}
+   */
+  getAsciiCast(id) {
     const adapter = this.store.adapterFor('application');
     const options = { adapterOptions: { method: 'download' } };
     const url = adapter.buildURL(
       'session-recording',
-      this.id,
+      id,
       options,
       'findRecord'
     );
     return adapter.ajax(url, 'GET', {
-      data: { connectionId, channelId, mimeType },
+      data: { mimeType: 'application/x-asciicast' },
     });
   }
 }