:art: Improve DICOM Reader Slow Init Warning

[John-P]

• Refactors the timeout warning to a generic context manger for timed-out warnings.
• Only shows the warning from the main process (to avoid output spam).

[codecov[bot]]

Codecov Report

Merging #105 (b92a308) into dev (1a49524) will increase coverage by 0.02%. The diff coverage is 94.73%.

@@            Coverage Diff             @@
##              dev     #105      +/-   ##
==========================================
+ Coverage   89.10%   89.12%   +0.02%     
==========================================
  Files          14       14              
  Lines        1946     1959      +13     
==========================================
+ Hits         1734     1746      +12     
- Misses        212      213       +1     

Impacted Files	Coverage Δ
wsic/utils.py	96.15% <92.85%> (-0.40%)	:arrow_down:
wsic/readers.py	86.06% <100.00%> (-0.04%)	:arrow_down:

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