Reduce SCALE memory usage

[tsalo]

Closes None, but is related to NBCLab/nimare-paper#21.

Changes proposed in this pull request:

• Loop over voxels when calculating p-values from SCALE null distributions, rather than keeping the full arrays in memory.

[codecov]

Codecov Report

Merging #632 (b89d06f) into main (7e094f2) will increase coverage by 0.35%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #632      +/-   ##
==========================================
+ Coverage   87.53%   87.89%   +0.35%     
==========================================
  Files          40       40              
  Lines        4316     4319       +3     
==========================================
+ Hits         3778     3796      +18     
+ Misses        538      523      -15     

Impacted Files	Coverage Δ
nimare/meta/cbma/ale.py	94.14% <100.00%> (+0.09%)	⬆️
nimare/meta/utils.py	88.70% <100.00%> (ø)
nimare/stats.py	94.23% <100.00%> (ø)
nimare/transforms.py	75.36% <100.00%> (ø)
nimare/utils.py	95.46% <100.00%> (ø)
nimare/diagnostics.py	95.40% <0.00%> (+17.24%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7e094f2...b89d06f. Read the comment docs.