Add the "sync" mode to api/order/create

[pkarw]

What is the motivation for adding / enhancing this feature?

Currently the vue-storefront-api order/create endpoint is pushing the order to Redis queue and then the orders are asynchronously pushed back to eCommerce backend (i.e. using o2m for pushing them to Magento2)

We achieved massive scalability by having order process async BUT in case of errors with transmitting the orders to the backend - the user is currently not avare of the problems

We need to move the createSingleOrder directly to https://github.com/DivanteLtd/vue-storefront-api/blob/92c96a6c28e78ba68f2e009d71bf9287ea89a078/src/api/order.js#L18

This second mode should be enabled via config variable

What are the acceptance criteria

• export createSingleOrder from kind of shared module/helper and use it inside order_2_magento and api/order/create
• add config variable config.orders.directBackendSync (default = false); when set to true then call createSingleOrder and return the result directly to the frontend
• add config.orders.directBackendSync (default = false) in the vue-storefront. When set to true then Checkout should not make the order async like currently is doing but rather place it and wait for the result (we probably need to modify this method: https://github.com/DivanteLtd/vue-storefront/blob/102b3923804ccd6d76de5965b7d9e57a14d82726/core/pages/Checkout.js#L323 - and use notification-progress-start event for displaying the "Processing order ..."

Can you complete this feature request by yourself?

YES but I'm short on time :)

[pkarw]

Of course: with this option set to on offline orders won't work - or rather: in offline mode we can not use this option (we need to use the fallback to current/default async behaviour anyway)