common/logging: Move Log::Entry declaration to a separate header

This reduces the load of requiring to include std::chrono in all files which include log.h

src/common/logging/log_entry.h

@@ -0,0 +1,28 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <chrono>
+
+#include "common/logging/types.h"
+
+namespace Common::Log {
+
+/**
+ * A log entry. Log entries are store in a structured format to permit more varied output
+ * formatting on different frontends, as well as facilitating filtering and aggregation.
+ */
+struct Entry {
+    std::chrono::microseconds timestamp;
+    Class log_class{};
+    Level log_level{};
+    const char* filename = nullptr;
+    unsigned int line_num = 0;
+    std::string function;
+    std::string message;
+    bool final_entry = false;
+};
+
+} // namespace Common::Log