feat: add support for discount code on Klaviyo's order placed event

[nicohps]

Klaviyo's order placed event supports a DiscountCode. This PR adds support for this.

[coderabbitai]

Walkthrough

The changes introduce a new optional property, discountCode, to the KlaviyoOrderPlacedEvent interface, allowing it to hold discount codes associated with orders. Additionally, the mapToKlaviyoOrderPlacedInput function is updated to include this discountCode in the orderProperties object sent to the Klaviyo API if it is present. The overall structure and logic of the functions remain unchanged.

Changes

File Path	Change Summary
packages/vendure-plugin-klaviyo/src/event-handler/...	Added optional property discountCode?: string; to KlaviyoOrderPlacedEvent interface.
packages/vendure-plugin-klaviyo/src/util/map-to-k...	Modified mapToKlaviyoOrderPlacedInput to include event.discountCode in orderProperties if defined.
packages/vendure-plugin-klaviyo/CHANGELOG.md	Updated changelog for version 1.2.1 to include support for DiscountCode on Placed Order event.

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• packages/vendure-plugin-klaviyo/CHANGELOG.md

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[martijnvdbrug]

Can you increase the version number in package.json + add a line in the Changelog file? This way it gets auto-published

[martijnvdbrug]

Version isn't same as package :-) Should be 1.2.1

[martijnvdbrug]

Thanks!