Improve map and struct logging

[taraktikos]

Currently, it works with standard string formatter:

testMap := map[string]any{
	"key1": "value1",
	"key2": "value2",
}
logger.Info("message", slog.Any("test", testMap))
logger.Info("message", slog.Any("test", TestMap{Key1: "value1", Key2: "value2"}))

2025-01-30 12:31:23 INF message test=map[key1:value1 key2:value2]
2025-01-30 12:31:23 INF message test={value1 value2}

What about adding config parameter to the handler to allow json marshal with or without indentation
It can looks like

marshaledMap, _ := json.MarshalIndent(testMap, "", "    ")
logger.Info("message", slog.String("test", string(marshaledMap)))

2025-01-30 12:31:23 INF message test={
    "key1": "value1",
    "key2": "value2"
}