feat: Add timezone to users

[tvdeyen]

Allows users to set a preferred timezone, so Alchemy can display time values in the timezone of the user.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.62%. Comparing base (aba24c5) to head (590a5b1).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #269   +/-   ##
=======================================
  Coverage   98.62%   98.62%           
=======================================
  Files          11       11           
  Lines         291      291           
=======================================
  Hits          287      287           
  Misses          4        4           

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