Work on fixing docstrings and splitting modules

[tsalo]

Closes None.

Changes proposed in this pull request

• Move functions into utils and interfaces into interfaces.
• Add docstrings when necessary.
• Start moving modified interfaces/functions from external libraries into main package.

[codecov-commenter]

Codecov Report

Base: 40.14% // Head: 39.95% // Decreases project coverage by -0.20% ⚠️

Coverage data is based on head (5dbbe37) compared to base (1c4257c).
Patch coverage: 72.70% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #210      +/-   ##
==========================================
- Coverage   40.14%   39.95%   -0.20%     
==========================================
  Files         186      192       +6     
  Lines       19878    19940      +62     
==========================================
- Hits         7981     7967      -14     
- Misses      11897    11973      +76     

Impacted Files	Coverage Δ
aslprep/__main__.py	0.00% <ø> (ø)
aslprep/cli/aggregate_qc.py	0.00% <0.00%> (ø)
aslprep/cli/workflow.py	46.66% <0.00%> (ø)
aslprep/config.py	89.81% <ø> (ø)
aslprep/utils/bids.py	43.85% <ø> (ø)
aslprep/utils/meepi.py	25.00% <ø> (ø)
aslprep/niworkflows/viz/plots.py	29.60% <12.50%> (-23.77%)	⬇️
aslprep/interfaces/ge.py	25.60% <25.60%> (ø)
aslprep/niworkflows/interfaces/plotting.py	74.57% <50.00%> (-8.57%)	⬇️
aslprep/utils/misc.py	63.54% <63.18%> (-36.46%)	⬇️
... and 27 more

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