Added Port object in grpc API

rpc/cc/arduino/cli/commands/v1/port.proto

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+// This file is part of arduino-cli.
+//
+// Copyright 2021 ARDUINO SA (http://www.arduino.cc/)
+//
+// This software is released under the GNU General Public License version 3,
+// which covers the main part of arduino-cli.
+// The terms of this license can be found at:
+// https://www.gnu.org/licenses/gpl-3.0.en.html
+//
+// You can be released from the requirements of the above licenses by purchasing
+// a commercial license. Buying such a license is mandatory if you want to
+// modify or otherwise use the software for commercial activities involving the
+// Arduino software without disclosing the source code of your own applications.
+// To purchase a commercial license, send an email to [email protected].
+
+syntax = "proto3";
+
+package cc.arduino.cli.commands.v1;
+
+option go_package = "github.com/arduino/arduino-cli/rpc/cc/arduino/cli/commands/v1;commands";
+
+// Port represents a board port that may be used to upload or to monitor a board
+message Port {
+  // Address of the port (e.g., `/dev/ttyACM0`).
+  string address = 1;
+  // The port label to show on the GUI (e.g. "ttyACM0")
+  string label = 2;
+  // Protocol of the port (e.g., `serial`, `network`, ...).
+  string protocol = 3;
+  // A human friendly description of the protocol (e.g., "Serial Port (USB)").
+  string protocol_label = 4;
+  // A set of properties of the port
+  map<string, string> properties = 5;
+}