[milestone] Ray Tracing

[damyanp]

TODO: refine milestone description

Milestone tracking when most Ray Tracing functionality is supported.

Workstreams

Language (#21)

• Full design for library shader linkage model

Tooling (#22)

• Shader library and linking design

Resource Binding (#23)

• Resource binding for libraries (createHandleForLib)

Root Signatures (#24)

• Local Root Signatures

Semantics (#25)

• Payload Access Qualifiers

Resources (#8)

• Ray tracing payloads
• Resources in libraries #123

DirectX Container (#9)

• Add Runtime Data part