When #54937 is resolved, DevTools server or DDS (depending on how DDS is running) will spawn the Dart Tooling Daemon. Some users will want to print this URI to the command line when running a Dart or Flutter app.

Proposal:

• Add a CLI flag --print-dtd flag that when present, would output the DTD URI to command line before the DevTools URI. There are multiple TODOs in https://dart-review.googlesource.com/c/sdk/+/354460 describing places where this flag will need to be plumbed through.

Here is the mirrored change for Flutter tools that adds a --print-dtd flag there: flutter/flutter#144272

@bkonyi