feat(crontab): Added crontab

[flc1125]

No description provided.

[what-the-diff]

PR Summary

• New Guide Introduced
  Added a new file named crontab/README.md. This contains instructions and codes that will aid in the usage of the system.

• Enhancement in System Security
  A new file crontab/mutex.go has been added. This file introduces a mutex interface and an error variable to enhance the concurrency control, potentially improving the system's security.

• Implementation of Redis Mutex
  A new file crontab/mutex/redis/mutex.go has been included. This file provides a Redis implementation of the mutex interface, enabling better data control when multiple processes are engaged.

• Server Capabilities Expansion
  A new file crontab/server.go has been added. This file provides an implementation for a server that can efficiently manage and execute cron jobs, increasing the system's automation capabilities.

• Dependencies Update
  The go.mod file has been updated to incorporate the dependencies required by these new files, ensuring that everything runs smoothly without interruptions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2520e53) 69.94% compared to head (eba6b16) 69.94%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #40   +/-   ##
=======================================
  Coverage   69.94%   69.94%           
=======================================
  Files          20       20           
  Lines         589      589           
=======================================
  Hits          412      412           
  Misses        170      170           
  Partials        7        7           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.