Skeleton of the new configuration for the Upgrade

Implementation of a new skeleton configuration file for the run-3 DaVinci application exploiting the GaudiConfig2 framework. Note that only a subset of what is needed wil lbe put here. Subsequent PRs will complete the full design, which requires also developments on the Gaudi side.

See issue https://gitlab.cern.ch/lhcb-dpa/project/-/issues/48.

DaVinci job with Upgrade configuration can be run using the following command lines:

• ./run gaudirun.py DaVinci.Configuration:mc (for MC files)
• ./run gaudirun.py DaVinci.Configuration:data (for data files)

DaVinciTests/tests/qmtest/davinci.qms/test_davinci_initialise_upgrade.qmt

+<?xml version="1.0" ?>
+<!--
+###############################################################################
+# (c) Copyright 2020 CERN for the benefit of the LHCb Collaboration           #
+#                                                                             #
+# This software is distributed under the terms of the GNU General Public      #
+# Licence version 3 (GPL Version 3), copied verbatim in the file "COPYING".   #
+#                                                                             #
+# In applying this licence, CERN does not waive the privileges and immunities #
+# granted to it by virtue of its status as an Intergovernmental Organization  #
+# or submit itself to any jurisdiction.                                       #
+###############################################################################
+-->
+<!DOCTYPE extension  PUBLIC '-//QM/2.3/Extension//EN'  'http://www.codesourcery.com/qm/dtds/2.3/-//qm/2.3/extension//en.dtd'>
+<!--
+#######################################################
+# SUMMARY OF THIS TEST
+# ...................
+# Author: dfazzini
+# Purpose: Very simple test of DaVinci configurable
+# Prerequisites: None
+#######################################################
+-->
+<extension class="GaudiTest.GaudiExeTest" kind="test">
+  <argument name="program"><text>gaudirun.py</text></argument>
+  <argument name="args"><set><text>DaVinci.ConfigurationUpgrade:mc</text></set></argument>
+  <argument name="reference"><text>$DAVINCITESTSROOT/tests/refs/test_initialise_upgrade</text></argument>
+  <argument name="error_reference"><text>$DAVINCITESTSROOT/tests/refs/empty.ref</text></argument>
+  <argument name="validator"><text>
+from DaVinciTests.QMTest.DaVinciExclusions import preprocessor
+validateWithReference(preproc = preprocessor)
+</text></argument>
+</extension>