[dds/dap] Support sending standard and custom progress notifications This adds the ability to send DAP progress notifications to the client. In this change, the CLI adapter sends them when connecting to the debugger, although the main motivation is to provide feedback when Hot Reload/Hot Restart is in progress (which will be handled in the Flutter adapter once this rolls in). Additionally, a flag allows sending custom notifications because VS Code's standard handling of notifications (which delays showing them for 500ms) does not work well for Flutter hot reload/hot restart (which can often complete in less time than that) so sending custom events allows the Dart extension to show the progress immediately instead. Change-Id: I1c91da6dc023b3d2d6cf3c6e8b8bbb53ee5167d2 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/261102 Reviewed-by: Ben Konyi <bkonyi@google.com> Commit-Queue: Ben Konyi <bkonyi@google.com>
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