feat: gracefully handle shutdown signals - #1577

PR Summary

• Introduction of Shutdown Signal Handlers
  A new function named registerShutdownSignalHandlers() has been added. Its purpose is to manage shutdown signals, these are alerts that inform the system when it needs to stop the program. This is crucial to maintain the program's integrity and prevent abrupt termination that might result in data loss or corruption.

• Graceful Shutdown Implementation
  We've added a function called shutDownGracefully(signal: string). This is used to note down the received signals and execute any cleanup operations required. Cleanup operations refer to the tasks completed by software when it receives a command to stop, to ensure all data and processes are correctly closed down.

• Placeholder for Future Cleanup Tasks
  The cleanup() function added is currently a placeholder. This means that while it does not currently perform any operations, it is meant to contain cleanup tasks in the future. Cleanup tasks are actions to be taken prior to shutting down a system to ensure no ongoing processes are interrupted, and no data is lost.

• Integration of Shutdown Handlers
  The startup method of the application (Booster.start()) will now call the registerShutdownSignalHandlers() function. This ensures that the shutdown handlers are active from the moment the project starts running, providing a safety net for proper system termination.