[dart-announce] Breaking change 50231: Remove support for Metrics from dart:developer

['Ben Konyi' via Dart Announcements]

Since the early days of the VM service protocol, the Dart VM has provided APIs for visualizing instantaneous metrics in graphs within Observatory through `dart:developer`, exposed through the Metrics interface.

This feature has been broken for quite some time in Observatory as we lost the ability to display charts and graphs as a consequence of the Dart 2.0 and null-safety migrations. DevTools also does not currently support displaying metrics, so it seems like a good time to trim an unused API.

See https://github.com/dart-lang/sdk/issues/50231 for more information and comment there if you have any concerns.

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