adds support for complex vectors to shift, part of #3690

[MichaelChirico]

#3690

[codecov]

Codecov Report

Merging #3693 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3693      +/-   ##
==========================================
+ Coverage   98.25%   98.25%   +<.01%     
==========================================
  Files          69       69              
  Lines       13088    13098      +10     
==========================================
+ Hits        12860    12870      +10     
  Misses        228      228

Impacted Files	Coverage Δ
src/shift.c	99.09% <100%> (+0.13%)	⬆️
R/coalesce.R	100% <0%> (ø)	⬆️
src/coalesce.c	100% <0%> (ø)	⬆️

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[codecov]

Codecov Report

Merging #3693 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3693      +/-   ##
==========================================
+ Coverage   98.26%   98.26%   +<.01%     
==========================================
  Files          69       69              
  Lines       13243    13257      +14     
==========================================
+ Hits        13013    13027      +14     
  Misses        230      230

Impacted Files	Coverage Δ
src/shift.c	99.09% <100%> (+0.13%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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