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This adds two new nodes: * `Grease Pencil to Curves`: Converts each grease pencil layer into an instance that contains curves. * `Curves to Grease Pencil`: Converts top-level curve instances into grease pencil layers. This opens up many new opportunities: * Use grease pencil as input to other procedural systems that don't necessarily output grease pencil. * Generate grease pencil from scratch using geometry nodes. * Temporarily convert grease pencil data to curves to use more powerful features for curves processing. Some data on layers are not attributes yet unfortunately, so there is some special case handling for the `opacity` attribute. This was previously discussed at the geometry nodes workshop: https://devtalk.blender.org/t/2024-05-13-geometry-nodes-workshop-notes/34760#grease-pencil-14 Pull Request: https://projects.blender.org/blender/blender/pulls/124279