Allow passing COGS in Invoice AIP

Name of Feature/Request: Allow passing COGS in Invoice API

What financial, time savings, or quality of life improvements will occur with this: We use average cost for inventory values. Because Striven is doing FIFO, this enables us to pass the

Attempted solutions so far: Using API Inventory Adjustments to update Value.

Digging deep - Any additional Why behind this request / How was this accomplished before Striven: Our prior iteration enabled us to directly pass COGS directly through invoices.