[Lite] Add public API for Lines

Questions
1

Hi,
I am currently trying to port a mid-size application to Babylon Lit (https://tuda-must.github.io/ITEP/library, ultrasound physics calculator). Here, I use LineMeshes for various things in the application. I could not find any equivalent to `CreateLineSystem` in Babylon Lite. Do you have any plans to add it or will it be a regular mesh with a different draw mode?

I recently learned that in BabylonJS, there is a difference in result between CreateLineSystem and load some lines from a GLTF. Maybe in the new Lite, it makes sense to thread both cases the same if possible.

Best regards,
Axel

2

I’ll be happy to work on that next! Stay tuned!