Add ETW-based DDI tracing and API sticker instrumentation for a new
encode codec on the APO D3D11 path, mirroring the existing HEVC DDI
trace pattern.
- Reserve four new encode DDI event slots in the public MEDIA_EVENT
  enum: status report, caps, picture parameters, and API sticker.
- Add internal trace helpers for the new caps and picture-parameter
  structures, and reuse the existing shared status-report serializer.
- Instrument every DDI entry point in the new encode class with API
  sticker start/stop events. The instrumentation uses an RAII scope
  guard so the stop event is emitted automatically on every return
  path (including the early returns driven by DDI_CODEC_CHK_*_RETURN
  macros), guaranteeing matched start/stop pairs in captured ETW
  traces. Explicit returns capture the actual HRESULT.
- Extend the internal ETW manifest and MediaAnalyzer metadata with the
  corresponding tasks, events, templates, and API value map so the new
  events are decodable end-to-end.
This makes the new encode DDI observable for debugging, capture, and
post-processing without changing any runtime behavior.