Add DXSC tool to patch specialization constant on DXIL

[akioCL]

Add new command line tool to be able to patch DXIL blobs so they can be used with specialization constants on O3DE.
The tool finds shader options (marked as volatiles) and replace them with normal constants. It also saves the bit offsets to each of these shader options so they can be patched at runtime. The DXIL blob is signed after the patching.

Full approach detailed here https://godotengine.org/article/d3d12-adventures-in-shaderland/

Based on RFC o3de/sig-graphics-audio#163

Other relevant PRs:
o3de/o3de-azslc#88
o3de/o3de#18019

[moudgils]

You will have to update the 3p package. I think the expected approach is to cut a new branch (release-1.7.2308-o3de.2) and then go through the process of creating a new 3p package. This process is much simpler now with Github actions.