Add BCLog::Logger::m_log_level data member and getter/setter

Co-authored-by: "klementtan <[email protected]>"

Author: jonatack

src/logging.h

@@ -74,6 +74,7 @@ namespace BCLog {
         Error,
         None, // Internal use only
     };
+    constexpr auto DEFAULT_LOG_LEVEL{Level::Debug};
 
     class Logger
     {
@@ -91,6 +92,10 @@ namespace BCLog {
          */
         std::atomic_bool m_started_new_line{true};
 
+        //! If there is no category-specific log level, all logs with a severity
+        //! level lower than `m_log_level` will be ignored.
+        std::atomic<Level> m_log_level{DEFAULT_LOG_LEVEL};
+
         /** Log categories bitfield. */
         std::atomic<uint32_t> m_categories{0};
 
@@ -143,6 +148,9 @@ namespace BCLog {
 
         void ShrinkDebugFile();
 
+        Level LogLevel() const { return m_log_level.load(); }
+        void SetLogLevel(Level level) { m_log_level = level; }
+
         uint32_t GetCategoryMask() const { return m_categories.load(); }
 
         void EnableCategory(LogFlags flag);