[all] Add topics to pubspecs (#4771)

Adds [topics](https://dart.dev/tools/pub/pubspec#topics) to all
packages, supporting the new pub feature for categorizing packages. The
heuristics I used were:
- Try to use existing topics from https://pub.dev/topics where
applicable
- Add new topics as necessary to cover things that seemed like obvious
relevant topics
- Include the plugin name as a topic for all federated plugin packages,
for grouping (since pub doesn't inherently group or cross-link
implementations)

This is not an attempt to be exhaustive; as topics evolve I expect we
will add more or adjust.

Also updates the repo tooling to enforce topics, so that we don't forget
to add them to new packages. The enforced rule is:
- All packages must have at least one topic. We could potentially change
this to allow an empty `topics` section so that we are enforcing that we
didn't just forget to add the section, but in practice even for packages
that we don't expect people to be likely to use, I didn't have any issue
coming up with at least one relevant topic.
- Federated plugin packages must contain the plugin name as a topic.

While this isn't time-critical, I chose to include version bumps so that
we aren't rolling out topics in a piecemeal way (e.g., with only a
random subset of a federated plugin's packages having topics on pub.dev
based on what has happened to have a bugfix).

Author: stuartmorgan-g

packages/animations/CHANGELOG.md

@@ -1,5 +1,6 @@
-## NEXT
+## 2.0.8
 
+* Adds pub topics to package metadata.
 * Updates minimum supported SDK version to Flutter 3.7/Dart 2.19.
 * Aligns Dart and Flutter SDK constraints.
 

packages/animations/pubspec.yaml

@@ -2,7 +2,7 @@ name: animations
 description: Fancy pre-built animations that can easily be integrated into any Flutter application.
 repository: https://github.com/flutter/packages/tree/main/packages/animations
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+animations%22
-version: 2.0.7
+version: 2.0.8
 
 environment:
   sdk: ">=2.19.0 <4.0.0"
@@ -17,6 +17,10 @@ dev_dependencies:
     sdk: flutter
   vector_math: ^2.1.0
 
+topics:
+  - animation
+  - ui
+
 screenshots:
   - description: 'Examples of the container transform pattern.'
     path: example/screenshots/container_transform_lineup.webp

packages/camera/camera/CHANGELOG.md

@@ -1,5 +1,6 @@
-## NEXT
+## 0.10.5+4
 
+* Adds pub topics to package metadata.
 * Updates minimum supported SDK version to Flutter 3.7/Dart 2.19.
 
 ## 0.10.5+3

packages/camera/camera/pubspec.yaml

@@ -4,7 +4,7 @@ description: A Flutter plugin for controlling the camera. Supports previewing
   Dart.
 repository: https://github.com/flutter/packages/tree/main/packages/camera/camera
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+camera%22
-version: 0.10.5+3
+version: 0.10.5+4
 
 environment:
   sdk: ">=2.19.0 <4.0.0"
@@ -36,3 +36,6 @@ dev_dependencies:
   mockito: 5.4.1
   plugin_platform_interface: ^2.0.0
   video_player: ^2.0.0
+
+topics:
+  - camera

packages/camera/camera_android/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.10.8+8
+
+* Adds pub topics to package metadata.
+
 ## 0.10.8+7
 
 * Fixes video record crash on Android versions lower than 12.

packages/camera/camera_android/pubspec.yaml

@@ -3,7 +3,7 @@ description: Android implementation of the camera plugin.
 repository: https://github.com/flutter/packages/tree/main/packages/camera/camera_android
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+camera%22
 
-version: 0.10.8+7
+version: 0.10.8+8
 
 environment:
   sdk: ">=2.19.0 <4.0.0"
@@ -29,3 +29,6 @@ dev_dependencies:
   async: ^2.5.0
   flutter_test:
     sdk: flutter
+
+topics:
+  - camera

packages/camera/camera_android_camerax/CHANGELOG.md

@@ -1,5 +1,6 @@
-## NEXT
+## 0.5.0+16
 
+* Adds pub topics to package metadata.
 * Updates minimum supported SDK version to Flutter 3.7/Dart 2.19.
 
 ## 0.5.0+15

packages/camera/camera_android_camerax/pubspec.yaml

@@ -2,7 +2,7 @@ name: camera_android_camerax
 description: Android implementation of the camera plugin using the CameraX library.
 repository: https://github.com/flutter/packages/tree/main/packages/camera/camera_android_camerax
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+camera%22
-version: 0.5.0+15
+version: 0.5.0+16
 
 environment:
   sdk: ">=2.19.0 <4.0.0"
@@ -33,3 +33,6 @@ dev_dependencies:
     sdk: flutter
   mockito: 5.4.1
   pigeon: ^9.1.0
+
+topics:
+  - camera

packages/camera/camera_avfoundation/CHANGELOG.md

@@ -1,5 +1,6 @@
-## NEXT
+## 0.9.13+4
 
+* Adds pub topics to package metadata.
 * Updates minimum supported SDK version to Flutter 3.7/Dart 2.19.
 
 ## 0.9.13+3

packages/camera/camera_avfoundation/pubspec.yaml

@@ -2,7 +2,7 @@ name: camera_avfoundation
 description: iOS implementation of the camera plugin.
 repository: https://github.com/flutter/packages/tree/main/packages/camera/camera_avfoundation
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+camera%22
-version: 0.9.13+3
+version: 0.9.13+4
 
 environment:
   sdk: ">=2.19.0 <4.0.0"
@@ -26,3 +26,6 @@ dev_dependencies:
   async: ^2.5.0
   flutter_test:
     sdk: flutter
+
+topics:
+  - camera