Sort invoice items

[o-psi]

This PR adds the ability to order invoice items.

I know we wanted to do draggable, but I need to practice JS more for that.

[wrongecho]

Test these changes at: https://Invoiceitemsorder762.pr-review.itflow.org
(automatic message)

[o-psi]

Update each invoice item and give it a, item order id

[johnnyq]

Nice work, you dont slow down hahhaa but can we rename item_order_id to just item_order we use id to reference items in multi tables and it would cause a little bit of confusion

[o-psi]

@johnnyq Done :)

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
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0.0% Duplication

[johnnyq]

So far so good on the item order I pulled it in it looks fantastic but needs some more functionality love
Item order should not be greater than the amount of items in an invoice as I can keep clicking the up and down arrows as many times to increment the order.

Some Logic to add

• If order is 0 do not show Up Arrow as this would be the first item
• If order is the last order do not show down arrow.

Of course once this is super stable we should replicate this everywhere recurring invoices, quotes, quote to invoice, cron generated invoices from recurring etc.

Great job!

[o-psi]

@johnnyq See #768

I believe this fixes your stability concern as it reduces complexity substantially, and additionally removes the arrows as suggested.