Make it possible to create/update variant prices programmatically using medusa container

[LukasGerm]

Hello, during writing a syncing mechanism, I found out that there is no way to actually update prices using the Medusa Container. You can create price lists and prices, but apparently not assign them to any product.

With the admin sdk you can do

sdk.admin.product.batch({
  update: [{
    variants: [{
      prices []
    }]
  }]
})

I found no way of doing this with the product module service or price service.