feat(logger): add logger manager to provide unified logging (#1267)

Signed-off-by: k4yt3x <i@k4yt3x.com>

include/libvideo2x/logger_manager.h

@@ -0,0 +1,48 @@
+#pragma once
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include <spdlog/logger.h>
+#include <spdlog/sinks/sink.h>
+
+#include "libvideo2x_export.h"
+
+namespace video2x {
+namespace logger_manager {
+
+class LIBVIDEO2X_API LoggerManager {
+   public:
+    LoggerManager(const LoggerManager &) = delete;
+    LoggerManager &operator=(const LoggerManager &) = delete;
+
+    static LoggerManager &instance();
+
+    std::shared_ptr<spdlog::logger> logger();
+
+    void reconfigure_logger(
+        const std::string &logger_name,
+        const std::vector<spdlog::sink_ptr> &sinks,
+        const std::string &pattern = "%+"
+    );
+
+    bool set_log_level(const std::string &level_str);
+
+    void hook_ffmpeg_logging();
+    void unhook_ffmpeg_logging();
+
+   private:
+    LoggerManager();
+
+    std::shared_ptr<spdlog::logger> logger_;
+};
+
+}  // namespace logger_manager
+
+// Convenience function to get the logger instance
+inline std::shared_ptr<spdlog::logger> logger() {
+    return logger_manager::LoggerManager::instance().logger();
+}
+
+}  // namespace video2x