[EMSUSD-141] Usd export does not respect the maya working units

We have maya set to work in inches, but when exporting a usd it is always written in cm. Would be great if there is an option to respect the units

In the maya preferences set the units to "inch"
export a box with unit size in inches

after exporting the usd will be in cm:
metersPerUnit = 0.01

and the size of the cube is 2.54

Ideally this would be
metersPerUnit = 0.0254

and the cube verts are 1 unit apart

Thanks,
Koen