[HLSL] Add implicit resource element type concepts to AST (#112600)

This PR is step one on the journey to implement resource element type
validation via C++20 concepts. The PR sets up the infrastructure for
injecting implicit concept decls / concept specialization expressions
into the AST, which will then be evaluated after template arguments are
instantiated. This is not meant to be a complete implementation of the
desired validation for HLSL,
there are a couple of missing elements:
1. We need the __builtin_hlsl_is_typed_resource_element_compatible
builtin to be implemented.
2. We need other constraints, like is_intangible
3. We need to put the first 2 points together, and construct a finalized
constraint expression, which should differ between typed and raw buffers

This is just an initial PR that puts some of the core infrastructure in
place.

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