Manage pending orders with transactions in the order app

[marcomontalbano]

closes commercelayer/issues-app#190 closes commercelayer/issues-app#238

What I did

"If an authorization or capture succeeded, but the associate order is still pending, it can happen that the order is updated and its total amount differs from the authorized or captured one. In this case, you must reset the related transaction by patching it (you need to use integration API credentials on the specific transaction type endpoint) with the _cancel trigger attribute set to true. At the end of the process, the order payment status will still be unpaid so that the payment can be completed with a different payment source." api-reference

This PR aims to manage the above situation.

You can try to place the order. Placing the order could fail for different reasons (e.g. authorization to old, order has been change in the meantime).

If "place" fails you can cancel the payment. In this case the order moves back to unpaid and the "checkout link" button becomes visible.

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