This commit adds a PLY format import node, part of the current Google Summer of Code Project [0]. The importer is refactored to output a mesh, and a node is added to wrap around the importer. The node supports error messages from the importer. The node is hidden behind an experimental option for now, like the others. 0: https://devtalk.blender.org/t/gsoc-2024-geometry-nodes-file-import-nodes/34482) Pull Request: https://projects.blender.org/blender/blender/pulls/125587