### What?
Adds `constructorOptions` property to the upload config to allow any of
[these options](https://sharp.pixelplumbing.com/api-constructor/) to be
passed to the Sharp library.
### Why?
Users should be able to extend the Sharp library config as needed, to
define useful properties like `limitInputPixels` etc.
### How?
Creates new config option `constructorOptions` which passes any
compatible options directly to the Sharp library.
#### Reported by client.
b372a34ebf