Added support for `itemCode` when handling order/checkout calc taxes in AvaTax

[krzysztofzuraw]

Added AvaTax itemCode support when handling order or checkout calculate taxes webhooks. After this change app will send itemCode to Avalara based on Saleor variant SKU or variant id.

Order confirmed handling is not affected as it was already sending itemCode.

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• [ ] I added changesets and read good practices.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 2d439e4fa765e10149daf263f974fe31b69bae5d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ---------- | ----- | | app-avatax | Minor |

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