Use array views in spin functions

[jishnub]

This should reduce some memory allocation

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -3.66 ⚠️

Comparison is base (3d6990d) 66.77% compared to head (7b108bb) 63.12%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main       #2      +/-   ##
==========================================
- Coverage   66.77%   63.12%   -3.66%     
==========================================
  Files           4        4              
  Lines         301      301              
==========================================
- Hits          201      190      -11     
- Misses        100      111      +11     

Impacted Files	Coverage Δ
src/spin.jl	92.50% <100.00%> (-6.25%)	⬇️

... and 1 file with indirect coverage changes

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[eschnett]

Thank you! I was not aware of the convenient @views macro, and didn't spot the places where the previous code had unnecessary allocations.