Reseller user can set Order to Paused

The reseller user can PAUSE campaigns through UI. For this we need to implement a "Pause Campaigns" button in UI which when clicked will Pause the campaigns in SE. The order status will be PAUSED.

The user can re-activate the campaigns by click Edit Account button and redeploying. This will create a new order for the account and hence we will be able to track the change in history.

Once PAUSED, we should disable the Pause button.

Note:
We are not touching the campaign accrual status as part of this story. If required, that will be handled as a separate piece of work.