spin-2 SHTs

[xzackli]

Preliminary support for QU to EB map2alm.

[codecov-commenter]

Codecov Report

Merging #30 (79c4629) into main (685ef18) will increase coverage by 1.87%.
The diff coverage is 81.63%.

@@            Coverage Diff             @@
##             main      #30      +/-   ##
==========================================
+ Coverage   68.57%   70.44%   +1.87%     
==========================================
  Files           4        4              
  Lines         420      467      +47     
==========================================
+ Hits          288      329      +41     
- Misses        132      138       +6     

Impacted Files	Coverage Δ
src/transforms.jl	91.42% <81.63%> (-3.40%)	⬇️

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