Use Gaussian interpolation for resampling tissue probability maps

[tsalo]

Closes none.

Changes proposed in this pull request

• Replace NearestNeighbor interpolation with Gaussian interpolation for resampling tissue probability maps, to match sMRIPrep's approach.
• Replace LanczosWindowedSinc interpolation with Gaussian interpolation for resampling CBF maps. This doesn't match what other tools do, but it may make more sense for CBF maps where we expect positive values.
  • I might try adding this in a separate PR.

[effigies]

Adding a note that this is consistent with smriprep's resampling strategy for tissue probability maps.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.86%. Comparing base (a1280d1) to head (3cd2a3b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #542   +/-   ##
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  Coverage   82.86%   82.86%           
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  Files          38       38           
  Lines        4079     4079           
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  Hits         3380     3380           
  Misses        699      699           

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