refactor: update ID generation methods and remove obsolete test file

- Renamed the GenerateMacMachineID method to GenerateSQMID and updated its implementation to generate a new SQM ID in UUID format.
- Enhanced the ID generation logic by introducing a buffer pool for efficient memory management.
- Removed the generator_test.go file as it was no longer needed, streamlining the codebase.
- Updated the generateNewConfig function to utilize the new SQMID generation method, ensuring consistency across ID generation processes.

cmd/cursor-id-modifier/main.go

@@ -240,7 +240,7 @@ func generateNewConfig(display *ui.Display, generator *idgen.Generator, oldConfi
 
 	if oldConfig != nil && oldConfig.TelemetrySqmId != "" {
 		newConfig.TelemetrySqmId = oldConfig.TelemetrySqmId
-	} else if sqmID, err := generator.GenerateMacMachineID(); err != nil {
+	} else if sqmID, err := generator.GenerateSQMID(); err != nil {
 		log.Fatal("Failed to generate SQM ID:", err)
 	} else {
 		newConfig.TelemetrySqmId = sqmID