Renderer: Move reflect_spirv to RenderingShaderContainer

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`

servers/rendering/rendering_device_commons.h

@@ -1073,6 +1073,4 @@ public:
 		BitField<ShaderStage> stages_bits = {};
 		BitField<ShaderStage> push_constant_stages = {};
 	};
-
-	static Error reflect_spirv(VectorView<ShaderStageSPIRVData> p_spirv, ShaderReflection &r_reflection);
 };