Performance improvements

[astrofrog]

• Improve performance of volume rendering with cubes that had uncorrelated axes when relying on reprojection (especially involving celestial coordinate transformations)

• Improve performance of profile viewer for subsets defined using only some pixel axes

• Improve performance of profile viewer by not computing profiles for non-visible layers.

[codecov]

Codecov Report

Merging #2115 into master will decrease coverage by 0.02%.
The diff coverage is 73.52%.

@@            Coverage Diff             @@
##           master    #2115      +/-   ##
==========================================
- Coverage   88.01%   87.98%   -0.03%     
==========================================
  Files         244      244              
  Lines       22249    22270      +21     
==========================================
+ Hits        19582    19595      +13     
- Misses       2667     2675       +8     

Impacted Files	Coverage Δ
glue/core/data.py	91.11% <57.89%> (-0.95%)	⬇️
glue/core/fixed_resolution_buffer.py	94.64% <87.50%> (-0.65%)	⬇️
glue/utils/array.py	95.34% <100.00%> (+0.03%)	⬆️
glue/viewers/profile/layer_artist.py	95.78% <100.00%> (+1.05%)	⬆️
glue/viewers/profile/state.py	98.83% <100.00%> (+0.01%)	⬆️

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