Replace RepetitionTime with RepetitionTimePreparation

[tsalo]

Closes #242.

Changes proposed in this pull request

• Use RepetitionTimePreparation instead of RepetitionTime for summaries. I decided to drop this change, since these summaries mostly generate plots that would break with irregular sampling.
• Extract RepetitionTimePreparation from M0 volumes only for BASIL, rather than just using the general RepetitionTime from the ASL metadata.
• Add RepetitionTimePreparation to output files' metadata. I kept RepetitionTime in there as well.
• Patch the test data by replacing the current RepetitionTimePreparation values (0 for some reason) with the RepetitionTime values.

Do I need to perform STC with RepetitionTimePreparation or RepetitionTime? If the former, can 3dTShift work with an array of TRs?

[codecov-commenter]

Codecov Report

Patch coverage: 64.07% and project coverage change: +0.53 🎉

Comparison is base (b1a516b) 45.09% compared to head (4565c9e) 45.63%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #245      +/-   ##
==========================================
+ Coverage   45.09%   45.63%   +0.53%     
==========================================
  Files         129      132       +3     
  Lines       12302    12483     +181     
==========================================
+ Hits         5548     5697     +149     
- Misses       6754     6786      +32     

Impacted Files	Coverage Δ
aslprep/interfaces/ge.py	24.35% <0.00%> (-1.26%)	⬇️
aslprep/workflows/asl/outputs.py	44.10% <ø> (ø)
aslprep/workflows/asl/stc.py	50.00% <ø> (ø)
aslprep/workflows/base.py	88.60% <ø> (ø)
aslprep/workflows/asl/cbf.py	59.17% <36.25%> (-0.43%)	⬇️
aslprep/workflows/asl/gecbf.py	14.65% <42.85%> (+1.01%)	⬆️
aslprep/tests/test_cli.py	77.33% <48.48%> (-22.67%)	⬇️
aslprep/workflows/asl/qc.py	54.38% <54.38%> (ø)
aslprep/interfaces/cbf_computation.py	68.78% <61.13%> (-3.18%)	⬇️
aslprep/workflows/asl/plotting.py	65.45% <65.45%> (ø)
... and 4 more

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