Make logging package usage less tedious

Before, we were exposing a Logger as logging.Log. This works, but
results in code calling Logger.Log.Info() which is a little wordy.

Instead, the logger is now kept private and we expose Info, Warn and
Error as public functions that wrap logger.Info, logger.Warn and
logger.Error.

internal/logging/logging.go

@@ -13,7 +13,7 @@ type Logger struct {
 }
 
 var (
-	Log Logger
+	logger Logger
 )
 
 func Init(appConfig *config.AppConfig) {
@@ -26,7 +26,7 @@ func Init(appConfig *config.AppConfig) {
 		Compress:   appConfig.LogCompression,
 	}
 
-	Log = Logger{
+	logger = Logger{
 		slog.New(
 			slog.NewJSONHandler(lj, &slog.HandlerOptions{
 				AddSource: appConfig.LogAddSource,
@@ -34,3 +34,15 @@ func Init(appConfig *config.AppConfig) {
 		),
 	}
 }
+
+func Info(msg string, args ...any) {
+	logger.Info(msg, args...)
+}
+
+func Warn(msg string, args ...any) {
+	logger.Warn(msg, args...)
+}
+
+func Error(msg string, args ...any) {
+	logger.Error(msg, args...)
+}