Adds BinaryIOWindow class

[tclose]

Adds BinaryIOWindow class so a part of a file can be presented as a file stream to be read into a 3rd party reader, e.g. trailing DICOM header appended to Siemens raw pet data files

[codecov]

Codecov Report

Attention: Patch coverage is 93.91304% with 7 lines in your changes missing coverage. Please review.

Project coverage is 92.37%. Comparing base (86f0f68) to head (4640a85).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
fileformats/core/io.py	96.26%	2 Missing and 2 partials ⚠️
fileformats/core/fileset.py	40.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #77      +/-   ##
==========================================
+ Coverage   92.34%   92.37%   +0.02%     
==========================================
  Files          44       45       +1     
  Lines        5108     5219     +111     
  Branches      560      580      +20     
==========================================
+ Hits         4717     4821     +104     
- Misses        296      301       +5     
- Partials       95       97       +2     

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