Describe the request

As a consumer of the gRPC API, I would like to receive an event if the gRPC equivalent of the board list watch command has started.

Currently, one can listen to the first BoardListWatchResponse event and consider the command running, but the first event might not ever arrive if the environment does have built-in ports (for example, COM1 on Windows, or /dev/cu.Bluetooth-Incoming-Port on macOS) although the command has successfully started and is running. A similar feature has been implemented for the monitor via 7afdc38.

Describe the current behavior

There is no explicit signaling if the gRPC equivalent of the board list watch has started.

Arduino CLI version

0.34.0

Operating system

macOS

Operating system version

13.5

Additional context

No response

Issue checklist

• I searched for previous requests in the issue tracker
• I verified the feature was still missing when using the nightly build
• My request contains all necessary details