Validation for resource element types

[damyanp]

Most HLSL resource types accept an element type, through a template parameter:

RWBuffer<float2> buffer;
Texture2D<float4> texture;
StructuredBuffer<MyStruct> anotherBuffer;

• [0011] Resource element type validation #69
• Type trait rules for buffer types #64
• [HLSL] Create __builtin_hlsl_is_typed_resource_element_compatible builtin llvm-project#113223
• [HLSL] Finalize Constraint expression for typed and raw buffer concepts. llvm-project#113224
• [HLSL] Add diagnostics for Buffers/RWBuffers with invalid element types llvm-project#75676