[pkgstats] Ingest assembly manifest

Instead of traversing the out directory looking for package manifests,
we can ingest the image_assembly.json (for base, cache, bootfs, etc).

Sample invocation:

```
fx pkgstats process \
    --assembly-manifest $FUCHSIA_DIR/out/core/obj/build/images/fuchsia/fuchsia/images.json \
    --out output.json
```

Bug: 399885925
Change-Id: I523f45fd7a78a33657b5560de7d1cb6963401de9
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1217844
Reviewed-by: Aidan Wolter <awolter@google.com>
Fuchsia-Auto-Submit: Miguel Flores <miguelfrde@google.com>
Commit-Queue: Miguel Flores <miguelfrde@google.com>
Reviewed-by: Christopher Johnson <crjohns@google.com>
2 files changed
tree: f913bf6c3fbf29b1f2ca73047921c6aa38a17a96
  1. .helix/
  2. boards/
  3. build/
  4. bundles/
  5. docs/
  6. examples/
  7. infra/
  8. products/
  9. scripts/
  10. sdk/
  11. src/
  12. third_party/
  13. tools/
  14. zircon/
  15. .clang-format
  16. .clang-tidy
  17. .editorconfig
  18. .git-blame-ignore-revs
  19. .gitattributes
  20. .gitignore
  21. .gitmodules
  22. .gn
  23. .ignore
  24. analysis_options.yaml
  25. AUTHORS
  26. BUILD.gn
  27. CODE_OF_CONDUCT.md
  28. CONTRIBUTING.md
  29. fuchsia.code-workspace
  30. LICENSE
  31. OWNERS
  32. PATENTS
  33. pyproject.toml
  34. pyrightconfig.json
  35. README.md
  36. rustfmt.toml
  37. shac.star
  38. shac.textproto
README.md

Fuchsia

What is Fuchsia?

Fuchsia is an open source, general purpose operating system supporting modern 64-bit Intel and ARM processors.

We expect everyone interacting with our project to respect our code of conduct.

Read more about Fuchsia's principles.

How can I build and run Fuchsia?

See Getting Started.

Where can I learn more about Fuchsia?

See fuchsia.dev.