[audio][adr] Observer signalprocessing support

Implement ObserverServer support for the signalprocessing
methods: WatchElementState and WatchTopology.

Test: audio_services_device_registry_unittests
Test: audio_services_device_registry_warning_unittests

Bug: 321292607

Change-Id: Ib9064d0c6150cb1c15180f9ac16df68c57d233e2
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1016527
Reviewed-by: Yegor Pomortsev <ypomortsev@google.com>
Commit-Queue: Martin Puryear <mpuryear@google.com>
6 files changed
tree: b77e9e66b38f28adbf4619c69cba531bd64a0d10
  1. boards/
  2. build/
  3. bundles/
  4. docs/
  5. examples/
  6. infra/
  7. products/
  8. scripts/
  9. sdk/
  10. src/
  11. third_party/
  12. tools/
  13. zircon/
  14. .clang-format
  15. .clang-tidy
  16. .editorconfig
  17. .git-blame-ignore-revs
  18. .gitattributes
  19. .gitignore
  20. .gitmodules
  21. .gn
  22. .ignore
  23. analysis_options.yaml
  24. AUTHORS
  25. BUILD.gn
  26. CODE_OF_CONDUCT.md
  27. CONTRIBUTING.md
  28. fuchsia.code-workspace
  29. LICENSE
  30. OWNERS
  31. PATENTS
  32. pyproject.toml
  33. pyrightconfig.json
  34. README.md
  35. rustfmt.toml
  36. shac.star
  37. shac.textproto
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