add complex sqrt

[wsmoses]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 78.02198% with 20 lines in your changes are missing coverage. Please review.

Project coverage is 75.49%. Comparing base (724b9bc) to head (0ed9538).

Files	Patch %	Lines
src/compiler.jl	77.77%	20 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1324      +/-   ##
==========================================
+ Coverage   75.40%   75.49%   +0.08%     
==========================================
  Files          36       36              
  Lines       10671    10698      +27     
==========================================
+ Hits         8047     8076      +29     
+ Misses       2624     2622       -2     

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[wsmoses]

Note requires EnzymeAD/Enzyme#1778 (which we should probably test locally first)