add method for zygote.seed(::CA)

[vpuri3]

fix https://github.com/jonniedie/ComponentArrays.jl/issues/228

with this PR

julia> Zygote.hessian(x -> sum(x.a .* x.b), p)
4×4 Matrix{Float64}:
 0.0  0.0  1.0  0.0 
 0.0  0.0  0.0  1.0 
 1.0  0.0  0.0  0.0 
 0.0  1.0  0.0  0.0 

[codecov-commenter]

Codecov Report

Merging #229 (534ccd8) into main (d22a56c) will decrease coverage by 0.57%. The diff coverage is 0.00%.

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@@            Coverage Diff             @@
##             main     #229      +/-   ##
==========================================
- Coverage   73.33%   72.76%   -0.57%     
==========================================
  Files          23       23              
  Lines         735      738       +3     
==========================================
- Hits          539      537       -2     
- Misses        196      201       +5     

Files	Coverage Δ
ext/ComponentArraysZygoteExt.jl	40.00% <0.00%> (-60.00%)	:arrow_down:

... and 1 file with indirect coverage changes

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[vpuri3]

@jonniedie

[jonniedie]

Would you mind throwing a test case in the autodiff tests with the Hessian example you showed? (And bumping the version number)