Allow converting to timezones other than Berlin

[rouzbeh]

Fix #30

[codecov]

Codecov Report

Merging #31 (f65d084) into main (cc743d7) will increase coverage by 0.00%.
The diff coverage is 57.14%.

@@           Coverage Diff           @@
##             main      #31   +/-   ##
=======================================
  Coverage   47.11%   47.11%           
=======================================
  Files          91       91           
  Lines        7745     7749    +4     
  Branches     1480     1481    +1     
=======================================
+ Hits         3649     3651    +2     
- Misses       4025     4027    +2     
  Partials       71       71           

Impacted Files	Coverage Δ
src/biopsykit/signals/imu/activity_counts.py	38.66% <57.14%> (+0.63%)	⬆️

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