[DirectX] Implement Shader Flags Analysis for TypedUAVLoadAdditionalFormats

[bharadwajy]

Set function-level flag TypedUAVLoadAdditionalFormats based on properties of DXIL::Opcode::BufferLoad, if present, in the candidate function - see here

This flag is named m_bUAVLoadAdditionalFormats in dxc sources.

AC:
Add tests to verify the flag is set.