[3.x]: Add ability to reorder Line Items when creating/editing CP Orders

[BrandKits]

What happened?

There's currently no way to reorder line items in the CP.

If you create an order... and forget to add a line item, it automatically appears at the top when added, with no way to reorder items, jumbling the order, and making little sense to the customer.

Can Order > Line Items have the same controls as Categories/Structures, reflecting the order on the back and front ends?

Craft CMS version

3.8.1

Craft Commerce version

3.4.20

PHP version

No response

Operating system and version

No response

Database type and version

No response

Image driver and version

No response

Installed plugins and versions

[jelmer-scoremedia]

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