Fix Cycles OptiX crash with 3D curves after point cloud changes

Includes refactoring to reduce the number of bits taken by primitive types,
so they more easily fit in the OptiX limit.

Fix T94251: Cycles wrong pointcloud normal for instanced objects

Refactor code a bit also so we need to do fewer matrix transforms for shader
data setup of points and curves.

Cleanup: compiler warnings with clang

Includes use of memcpy to avoid warnings about deprecated members.

Fix T94215: compositer denoise node UI wrongly shows as disabled

After recent refactoring in 4e98d974b596.

Fix error in Cycles geometry update tagging after pointcloud addition

Thanks to Christophe Hery for spotting this.

Cycles: pointcloud rendering

This add support for rendering of the point cloud object in Blender, as a native
geometry type in Cycles that is more memory and time efficient than instancing
sphere meshes. This can be useful for rendering sand, water splashes, particles,
motion graphics, etc.

Points are currently always rendered as spheres, with backface culling. More
shapes are likely to be added later, but this is the most important one and can
be customized with shaders.

For CPU rendering the Embree primitive is used, for GPU there is our own
intersection code. Motion blur is suppored. Volumes inside points are not
currently supported.

Implemented with help from:
* Kévin Dietrich: Alembic procedural integration
* Patrick Mourse: OptiX integration
* Josh Whelchel: update for cycles-x changes

Ref T92573

Differential Revision: https://developer.blender.org/D9887

Revert "Cycles-X: Add hysteresis to resolution divider algorithm"

This reverts commit d8b42751625c915113b64f5a2d9c72f19f009fee. It causes reduced
viewport render resolution. Revert for now until I have time to look into this
more closely.

Fix T93995: Cycles camera motion blur not working in right stereo view

Thanks to Michael (michael64) for identifying the solution.

Ref D13567

Cycles: add text explaining minimum requirements for Metal when no device found

Cycles: enable Metal GPU rendering

This adds the remaining bits to enable Metal on macOS. There are still
performance optimizations and other improvements planned, but it should
now be ready for early testing.

This is currently only enabled on in Arm builds for M1 GPUs. It is not
yet working on AMD or Intel GPUs.

Ref T92212

Differential Revision: https://developer.blender.org/D13503