Rename Timezone to Zone

[Baptouuuu]

As Time is already in the namespace

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.40%. Comparing base (bed1cec) to head (04122fd).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main       #3   +/-   ##
=========================================
  Coverage     98.40%   98.40%           
  Complexity      772      772           
=========================================
  Files            62       62           
  Lines          2564     2564           
=========================================
  Hits           2523     2523           
  Misses           41       41           

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