Add interop support for naming and "calling" C++ templates. #6474
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Expose C++ class templates, variable templates, alias templates, and concepts as callable values in Carbon, and map calls to them into template-id formation, mirroring how Carbon generics behave. For now, only type template parameters are supported; non-type and template template parameters produce a TODO error.
Depends on #6473, which is factored out to keep the test updates reviewable.