LanguageClient: Introduce workspace matchers

Change-Id: I958e83f140ce5d12a5fb6734b9fbfd8a5f95a787
Reviewed-by: David Schulz <david.schulz@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

src/plugins/languageclient/languageclientplugin.cpp

@@ -33,6 +33,12 @@ LanguageClientPlugin *LanguageClientPlugin::instance()
     return m_instance;
 }
 
+Utils::FutureSynchronizer *LanguageClientPlugin::futureSynchronizer()
+{
+    QTC_ASSERT(m_instance, return nullptr);
+    return &m_instance->m_futureSynchronizer;
+}
+
 void LanguageClientPlugin::initialize()
 {
     using namespace Core;