[HLSL] Disassemble DX Container Root Signatures

[joaosaffran]

Add support to Root Signature into obj2yaml tool to convert the DXContainer into YAML.

The objective of this is being able to test if the values extracted from LLVM IR are correctly being reflected into the DXContainer.

This is a list of Root Elements to add support to:

• RootFlags - [DXIL] Adding support to RootSignatureFlags in obj2yaml #122396
• RootConstants [DXContainer] Obj2yaml support for root constants  #124813
• RootCBV
• RootSRV
• RootUAV
• DescriptorTable
• StaticSampler