[HLSL] Implement c-style apis for accessing outputs of shader compilation

[coopp]

DXC exposes a COM based library today for compiling shaders and accessing specific data in the outputs of the compilation.
A desire has been expressed to have an equivalent solution exposed in pure c apis. These apis should cover all features required to provide access to this data.

This issue is to implement the design completed in Issue #91623 .

Issue #90782 should have all of the infrastructure figured out so the work will be to add the additional apis to the c-style compiler library with tests.