Allow me to set Start and Stop Time Codes on stages created with new layer

**Is your feature request related to a problem? Please describe.**
It seems that when I create a stage with a new layer, my start/stop time codes are always 0,0 (whereas if i export a scene, I can specify a frame range)

**Describe the solution you'd like**
I'd like to set my time range either in attributes or on saving of the stage when Maya pops up the 'would you like to save your maya file and usd layers?'

**Describe alternatives you've considered**
- Attribute editor of start/stop timecode/frame
- Ask on save
- UFE integration/dialog

**Additional context**
whatever this is^ seems to have no effect on the saving of the stage/layers