Collect and apply field maps

[tsalo]

Closes #63. So far this is just an early attempt to collect (but not yet apply) the field maps.

Changes proposed in this pull request

• Draft a method to collect field maps.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 30.63%. Comparing base (cf32223) to head (56f6262).

Files with missing lines	Patch %	Lines
src/fmripost_aroma/workflows/base.py	0.00%	5 Missing ⚠️
src/fmripost_aroma/utils/bids.py	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #79      +/-   ##
==========================================
+ Coverage   30.59%   30.63%   +0.03%     
==========================================
  Files          26       26              
  Lines        2363     2373      +10     
  Branches      286      288       +2     
==========================================
+ Hits          723      727       +4     
- Misses       1617     1622       +5     
- Partials       23       24       +1     

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