This change introduces a new protected type, `ReflectedShaderStage` to
`RenderingShaderContainer` that derived types use to access SPIR-V and
the reflected module, `SpvReflectShaderModule` allowing implementations
to use the reflection information to compile their platform-specific
module.
* Fixes memory leak in `reflect_spirv` that would not deallocate the
`SpvReflectShaderModule` if an error occurred.
* Removes unnecessary allocation when creating `SpvReflectShaderModule`
by passing `NO_COPY` flag to `spvReflectCreateShaderModule2`
constructor function.
* Replaces `VectorView` with `Span` for consistency
* Fixes unnecessary allocations in D3D12 shader container in
`_convert_spirv_to_nir` and `_convert_spirv_to_dxil` which implicitly
converted the old `VectorView` to a `Vector`
