Implement PLY file reading using property accessor

[bourumir-wyngs]

PLY file reading is currently implemented in a simplified way (see points3d_ext.rs). This could be optimized by using custom property accessors (you already have a TODO comment in the code referring to this). Such an improvement would enhance performance when handling large and high-resolution PLY files, some of which can be very large in practice.

For your API, this would not introduce any breaking changes.

I would be happy to implement this optimization using property accessors (I am a maintainer of ply-rs-bw and know it). Although the change itself is not extensive, I would prefer to discuss the approach in advance before proceeding and submitting a PR.

[Wumpf]

Sorry for the reply delay! This sounds awesome and not like it has any drawbacks? 😄
What do you imagine this could look like? I mean clearly you know the ply-rs-bw api best :)