Added logging level getter

Signed-off-by: Thien Nguyen <nguyentm@ornl.gov>

xacc/utils/Utils.cpp

@@ -270,6 +270,17 @@ void XACCLogger::setLoggingLevel(int level) {
   }
 }
 
+int XACCLogger::getLoggingLevel() {
+  const auto spdLevel = getLogger()->level();
+  switch (spdLevel) {
+  case spdlog::level::trace:
+  case spdlog::level::debug: return 2;
+  case spdlog::level::info: return 1;
+  default:
+    return 0;
+  }
+}
+
 void XACCLogger::info(const std::string &msg, MessagePredicate predicate) {
   if (useCout) {
     if (predicate() && globalPredicate()) {

xacc/utils/Utils.hpp

@@ -201,7 +201,8 @@ public:
   // 2: Debug and above
   // Note: this will only take effect when xacc::verbose is set.
   void setLoggingLevel(int level);
-
+  int getLoggingLevel();
+  
   void subscribeLoggingLevel(LoggingLevelNotification onLevelChangeFn) { 
     loggingLevelSubscribers.emplace_back(onLevelChangeFn);
   }

xacc/xacc.cpp

@@ -119,6 +119,10 @@ void setLoggingLevel(int level) {
   XACCLogger::instance()->setLoggingLevel(level);
 }
 
+int getLoggingLevel() {
+  return XACCLogger::instance()->getLoggingLevel();
+}
+
 void subscribeLoggingLevel(LoggingLevelNotification callback) {
   XACCLogger::instance()->subscribeLoggingLevel(callback);
 }

xacc/xacc.hpp

@@ -97,6 +97,7 @@ void addCommandLineOptions(const std::map<std::string, std::string> &options);
 void setGlobalLoggerPredicate(MessagePredicate predicate);
 void logToFile(bool enable);
 void setLoggingLevel(int level);
+int getLoggingLevel();
 void subscribeLoggingLevel(LoggingLevelNotification callback);
 
 void info(const std::string &msg,