Add file path as a dicom dataset attribute

[shuo-zhou]

Description

Add file path as a dicom dataset attribute.

Status

Ready

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• Breaking change (fix or new feature that would cause existing functionality to change).
• New tests added to cover the changes.
• In-line docstrings updated.
• Source for documentation at docs manually updated for new API.

[codecov-commenter]

Codecov Report

Merging #345 (fdc3aff) into main (e8e1fd1) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #345   +/-   ##
=======================================
  Coverage   92.81%   92.81%           
=======================================
  Files          46       46           
  Lines        5077     5078    +1     
=======================================
+ Hits         4712     4713    +1     
  Misses        365      365           

Impacted Files	Coverage Δ
kale/loaddata/image_access.py	97.32% <100.00%> (+0.01%)	⬆️

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[Schobs]

Great change. Now when you load a DICOM, each phase image is saved along with an attribute called "FilePath" which links the filepath to the loaded image.