GODT-1667: bridge-gui spawns bridge process. [skip-ci]

Other: renaming of bridge-gui.
WIP: locate bridge exe.
WIP: bridge process launch.
WIP: cleaner closure of bridge.
WIP: grpcClient connection retries.
WIP: clean exit when bridge process is killed.

Fixed issues from MR review. [skip-ci].

WIP: Fixed gRPC case in CMakelists.txt [skip-ci]

It caused issues on Debian.

WIP: update gRPC/protobuf and tweaked CMakeLists.txt. [skip-ci]

WIP: Fixed a bug where splash screen could not be dismissed. [skip-ci]

internal/frontend/bridge-gui/qml/DebugWrapper.qml

@@ -0,0 +1,55 @@
+// Copyright (c) 2022 Proton AG
+//
+// This file is part of Proton Mail Bridge.
+//
+// Proton Mail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Proton Mail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>.
+
+import QtQuick 2.13
+import QtQuick.Controls 2.12
+
+import "."
+import "./Proton"
+
+Rectangle {
+    property var target: parent
+
+    x: target.x
+    y: target.y
+    width: target.width
+    height: target.height
+
+    color: "transparent"
+    border.color: "red"
+    border.width: 1
+    //z: parent.z - 1
+    z: 10000000
+
+    Label {
+        text: parent.width + "x" + parent.height
+        anchors.centerIn: parent
+        color: "black"
+        colorScheme: ProtonStyle.currentStyle
+    }
+
+    Rectangle {
+        width: target.implicitWidth
+        height: target.implicitHeight
+
+        color: "transparent"
+        border.color: "green"
+        border.width: 1
+        //z: parent.z - 1
+        z: 10000000
+    }
+}