Add unique comment to cancellation from re-route fulfillment app

[dt2patel]

When customer cancels from re-route fulfillment app, there should be a special comment on the cancelation so it's easy to tell why cancelation occurred.

itemCommentMap: "Canceled by customer using Re-Route"

[ymaheshwari1]

Handled this change in the custom app.

Need to handle this in the public app. Also when passing comment/reason map need to pass the payload as:

"orderId": this.order.id,
"shipGroupSeqId": shipGroup.shipGroupSeqId,
"token": this.token,
irm_<orderItemSeqId>: "OICR_CHANGE_MIND",
icm_<orderItemSeqId>: "Canceled by customer using Re-Route"

Do not need to send itemCommentMap/itemReasonMap in payload, all the items will be passed as a separate key/value pair as mentioned above.

[amansinghbais]

This is handled in v2 app: #100