Use pub workspace for the dart-pad monorepo

[johnpryan]

This sets up a pub workspace for each of the packages in this monorepo. This lets us run dart pub get from the root of the project and take advantage of a shared analysis server.

[johnpryan]

The pub did not create .dart_tools/package_config.json file. error is likely due to the fact that we have not finished adding support for workspaces to the flutter tool.

[github-actions[bot]]

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[johnpryan]

Some of our GitHub Actions are using the Dart SDK (not the Flutter SDK), so when, for example, we dart pub get in dart_services, we get this warning:

Flutter users should use `flutter pub` instead of `dart pub`.

This seems like it should be a warning, since this is running in a Dart package, not a Flutter package. But since the workspace contains Flutter and Dart packages, our CI tools need to run flutter pub get on every individual package.

We could try to work around this by using the Flutter SDK everywhere, but that seems unnecessary. @devoncarew WDYT?

[devoncarew]

We could try to work around this by using the Flutter SDK everywhere, but that seems unnecessary. @devoncarew WDYT?

I haven't parsed everything that's going on here, but dart pub get should work everywhere? It'll work with dart packages, and if the dart cli is from a Dart sdk hosted in a flutter sdk, then that dart command will be able to resolve the flutter sdk packages, so dart pub get should work there as well.

[johnpryan]

if the dart cli is from a Dart sdk hosted in a flutter sdk, then that dart command will be able to resolve the flutter sdk packages

Is this true for workspaces too?

[johnpryan]

Closing in favor of https://github.com/dart-lang/dart-pad/pull/3151, we can just use flutter for the actions