Add Vulkan uniform buffer and LUT texture support

- Implement VulkanBuilder uniform buffer creation and update for dynamic parameters
- Add 3D LUT texture allocation with RGBA format (RGB32F not supported on MoltenVK)
- Add 1D/2D LUT texture allocation with proper format handling
- Fix shader generation to use correct descriptor bindings for textures and uniforms
- Add std140 layout qualifier to OCIO uniform blocks
- Update descriptor set layout and pool sizes to include uniforms and textures
- Call updateUniforms() before each dispatch for dynamic parameter updates

Test results: 216/263 tests pass (82%)
Remaining failures are complex uniform blocks with vec3 types that need
additional std140 alignment handling.

Author: pmady