Cleans up the reading of DICOM metadata and returns dictionary not DICOM object

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[codecov]

Codecov Report

Attention: Patch coverage is 85.14851% with 15 lines in your changes missing coverage. Please review.

Project coverage is 92.25%. Comparing base (3abc44d) to head (74923c2).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
fileformats/generic/directory.py	81.08%	7 Missing ⚠️
fileformats/application/medical.py	88.23%	2 Missing and 2 partials ⚠️
fileformats/core/fileset.py	73.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #84      +/-   ##
==========================================
- Coverage   92.29%   92.25%   -0.05%     
==========================================
  Files          45       45              
  Lines        5233     5255      +22     
  Branches      589      597       +8     
==========================================
+ Hits         4830     4848      +18     
- Misses        294      301       +7     
+ Partials      109      106       -3     

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