wgsl: validate parsing or storage texture types

[dj2]

For each of the storage textures {texture_storage_1d, texture_storage_2d, texture_storage_2d_array and texture_storage_3d}

• [ ] Missing texel_format fails texture_storage_1d<write>
• [x] Invalid texel_format fails texture_storage_1d<invalid, write>
• [ ] No params fails texture_storage_1d and texture_storage_1d<>
• [ ] Missing comma fails texture_storage_1d<rgba32float write>
• [ ] Missing access parameter fails
• [ ] Access parameter of read fails
• [ ] Access parameter of read_write fails
• [x] Invalid access parameter fails
• [ ] Missing opening and closing < and >
• [ ] with embedded comments texture_storage_1d/* comment*/<\nr32float/* comment */, write\n\n>

4.6.5. Storage Texture Types

[dj2]

https://github.com/gpuweb/cts/blob/main/src/webgpu/shader/validation/types/textures.spec.ts