ref(update): Adding caching to checking for latest version

[IanWoodard]

Currently we hit the GitHub api each time a command is run which can lead to being rate limited and adds additional bloat that makes commands feel less snappy. To remedy this, this change adds a simple caching mechanism that stores the version it retrieves from the GitHub api for 15 minutes before refetching again. This should be often enough to still promptly inform users of updates while not sending unnecessary requests to the GitHub api.
I also moved check_for_update out of commands and into utils where I believe it belongs. I also added some preliminary testing for check_for_update.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.75%. Comparing base (0f26f0b) to head (fd3eebc).
Report is 2 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #179      +/-   ##
==========================================
+ Coverage   92.03%   92.75%   +0.71%     
==========================================
  Files          22       22              
  Lines        1306     1339      +33     
==========================================
+ Hits         1202     1242      +40     
+ Misses        104       97       -7     

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[hubertdeng123]

Looking good! 🚀