License update - Batch 56

[mossmana]

Updates the license headers for:

1. packages/devtools_extensions/example/packages_with_extensions/dart_foo/packages/dart_foo/README.md
2. packages/devtools_extensions/example/packages_with_extensions/dart_foo/packages/dart_foo/extension/devtools/build/index.html
3. packages/devtools_extensions/example/packages_with_extensions/dart_foo/packages/dart_foo/extension/devtools/config.yaml
4. packages/devtools_extensions/example/packages_with_extensions/dart_foo/packages/dart_foo/lib/dart_foo.dart
5. packages/devtools_extensions/example/packages_with_extensions/dart_foo/packages/dart_foo/pubspec.yaml
6. packages/devtools_extensions/example/packages_with_extensions/dart_foo/packages/dart_foo_devtools_extension/README.md
7. packages/devtools_extensions/example/packages_with_extensions/dart_foo/packages/dart_foo_devtools_extension/lib/main.dart
8. packages/devtools_extensions/example/packages_with_extensions/dart_foo/packages/dart_foo_devtools_extension/pubspec.yaml
9. packages/devtools_extensions/example/packages_with_extensions/dart_foo/packages/dart_foo_devtools_extension/web/index.html
10. packages/devtools_extensions/example/packages_with_extensions/foo/packages/foo/README.md
11. packages/devtools_extensions/example/packages_with_extensions/foo/packages/foo/extension/devtools/build/index.html
12. packages/devtools_extensions/example/packages_with_extensions/foo/packages/foo/extension/devtools/config.yaml
13. packages/devtools_extensions/example/packages_with_extensions/foo/packages/foo/lib/foo.dart
14. packages/devtools_extensions/example/packages_with_extensions/foo/packages/foo/lib/src/foo_controller.dart
15. packages/devtools_extensions/example/packages_with_extensions/foo/packages/foo/lib/src/foo_widget.dart
16. packages/devtools_extensions/example/packages_with_extensions/foo/packages/foo/pubspec.yaml
17. packages/devtools_extensions/example/packages_with_extensions/foo/packages/foo_devtools_extension/README.md
18. packages/devtools_extensions/example/packages_with_extensions/foo/packages/foo_devtools_extension/lib/main.dart
19. packages/devtools_extensions/example/packages_with_extensions/foo/packages/foo_devtools_extension/lib/src/common/ui.dart
20. packages/devtools_extensions/example/packages_with_extensions/foo/packages/foo_devtools_extension/lib/src/feature_examples/devtools_event_example.dart
21. packages/devtools_extensions/example/packages_with_extensions/foo/packages/foo_devtools_extension/lib/src/feature_examples/devtools_extension_api_example.dart
22. packages/devtools_extensions/example/packages_with_extensions/foo/packages/foo_devtools_extension/lib/src/feature_examples/dtd_example.dart
23. packages/devtools_extensions/example/packages_with_extensions/foo/packages/foo_devtools_extension/lib/src/feature_examples/expression_evaluation_example.dart
24. packages/devtools_extensions/example/packages_with_extensions/foo/packages/foo_devtools_extension/lib/src/feature_examples/service_extension_example.dart
25. packages/devtools_extensions/example/packages_with_extensions/foo/packages/foo_devtools_extension/lib/src/foo_devtools_extension.dart
26. packages/devtools_extensions/example/packages_with_extensions/foo/packages/foo_devtools_extension/pubspec.yaml
27. packages/devtools_extensions/example/packages_with_extensions/foo/packages/foo_devtools_extension/web/index.html
28. packages/devtools_extensions/example/packages_with_extensions/standalone_extension/README.md
29. packages/devtools_extensions/example/packages_with_extensions/standalone_extension/extension/devtools/build/index.html
30. packages/devtools_extensions/example/packages_with_extensions/standalone_extension/extension/devtools/config.yaml
31. packages/devtools_extensions/example/packages_with_extensions/standalone_extension/lib/main.dart
32. packages/devtools_extensions/example/packages_with_extensions/standalone_extension/pubspec.yaml
33. packages/devtools_extensions/example/packages_with_extensions/standalone_extension/web/index.html

#8216

Pre-launch Checklist

• I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
• I read the [Tree Hygiene] wiki page, which explains my responsibilities.
• I read the [Flutter Style Guide] recently, and have followed its advice.
• I signed the [CLA].
• I listed at least one issue that this PR fixes in the description above.
• I updated/added relevant documentation (doc comments with ///).
• I added new tests to check the change I am making, or there is a reason for not adding tests.