Shift PostLabelingDelay(s) by slice times

[tsalo]

Closes #189.

Changes proposed in this pull request

• Shift PLDs by slice times, when necessary.

[tsalo]

scrub_summary is failing for the Philips dataset (which is the only single-PLD test dataset with slice timing info).

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (main@38962f2). Click here to learn what that means.
Patch coverage: 90.29% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #280   +/-   ##
=======================================
  Coverage        ?   49.52%           
=======================================
  Files           ?      132           
  Lines           ?    12215           
  Branches        ?        0           
=======================================
  Hits            ?     6050           
  Misses          ?     6165           
  Partials        ?        0           

Impacted Files	Coverage Δ
aslprep/tests/utils.py	43.75% <14.28%> (ø)
aslprep/workflows/asl/cbf.py	81.36% <80.00%> (ø)
aslprep/interfaces/cbf_computation.py	81.98% <83.87%> (ø)
aslprep/tests/test_interfaces_cbf_computation.py	100.00% <100.00%> (ø)
aslprep/utils/misc.py	62.50% <100.00%> (ø)

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