feat: 优化日志系统，添加日志器缓存机制

tests/test-logs.c

@@ -0,0 +1,24 @@
+#include "logging.h"
+#include "logging/logging-core.h"
+#include <stdio.h>
+
+int main() {
+    Logger *t1  = getLogger("Test1");
+    t1->level   = LOG_ERROR;
+
+    Logger *t2  = getLogger("Test2");
+    t2->level   = LOG_DEBUG;
+
+    Logger *t11 = getLogger("Test1");
+
+    if (t1 == t11) {
+        printf("t1 and t11 are the same\n");
+        printf("t1 log level: %s", LOG_LEVEL_STR[t11->level]);
+    } else {
+        printf("t1 and t11 are different\n");
+        return 1;
+    }
+
+    destroyDefaultLogger();
+    return 0;
+}