Opinionated asset importer

Dependencies:

• GLTF parser: fastgltf
• Asset Optimizer: meshoptimizer
• Job System: mr-contractor

Note that these are downloaded in the CMake script via CPM

TODO: (feat)

• Load textures (with samplers)
• Load materials

TODO: (perf)

• Dont copy data in the Extractor phase as there shouldn't be any shared data between different primitives
• Handle uniqueness of buffers (as in manager)
• Determine sequential/parallel execution based on asset size
• Determine whether meshopt routines are necessary based on mesh size