handle comment replies

comment reply format:

{
  "success": true,
  "error": null,
  "data": [
    {
      "id": 298637,
      "user_id": 1348310,
      "type": "",
      "notification_rule": "comment",
      "notification_parameters": {
        "email": {
          "email": "",
          "prefix": "",
          "subject": "",
          "placeholders": null,
          "email_template": ""
        },
        "device": {
          "name": "",
          "text": "wassuppppppp",
          "type": "comment",
          "title": "@thomas.zarebczan replied to a comment on Test",
          "target": "lbry://img#4ef28d4b8fefa9e7fb37a078226d1749b08c2359",
          "image_url": "",
          "is_data_only": true,
          "placeholders": null,
          "analytics_label": "comment"
        },
        "dynamic": {
          "hash": "1177bc39d09f1ab8c50596278d85f32236161d014018bc35ff04018e7071436a",
          "comment": "wassuppppppp",
          "parent_id": "dcacdc8513186415642a9ce4c3c229c15b8b6ab8c0f5014cf1dc7d4b97332d24",
          "claim_title": "Test",
          "comment_author": "lbry://@thomas.zarebczan#cb7ea953be131d156a780ff400414a187123e589"
        }
      },
      "is_app_readable": true,
      "is_read": true,
      "is_emailed": true,
      "is_device_notified": false,
      "active_at": "2020-09-15T21:44:49Z",
      "created_at": "2020-09-15T21:44:49Z",
      "updated_at": "2020-09-15T21:44:54Z",
      "is_seen": true
    },

The issue provides a sample notification JSON response for a comment reply but names no source files, tests, or entry points. Start by locating the code that handles comment notifications and compare its behavior with the provided reply format. Done should mean comment replies are handled correctly and covered by an appropriate test.