[DirectX] Create symbols for resource handles (#119775)
We need to create symbols with "the original shape of resource and
element type" to put in the resource metadata in order to generate valid
DXIL.
Note that DXC generally doesn't emit an actual symbol outside of library
shaders (it emits an undef of a pointer to the type), but since we have
to deal with opaque pointers we would need a way to smuggle the type
through to match that. Instead, we simply emit symbols for now.
Fixed #116849
