Fix `recursive_eltype` not defined when constructing ComponentArray on the GPU

[ldeso]

Hi,

After the switch to Julia extensions (#192), the methods that are not exported by ComponentArrays are not accessible in the extension source files. This leads to an undefined reference when calling recursive_eltype at line 77 in the constructor of ComponentArray on the GPU:

https://github.com/jonniedie/ComponentArrays.jl/blob/97eb9e3db7904ea13b823403d00ddd9e9d6c078f/ext/ComponentArraysGPUArraysExt.jl#L76-L81

This pull request adds the missing import and fixes #209.

[codecov-commenter]

Codecov Report

Merging #210 (526e97d) into master (118ef79) will not change coverage. The diff coverage is n/a.

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@@           Coverage Diff           @@
##           master     #210   +/-   ##
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  Coverage   73.00%   73.00%           
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  Files          20       20           
  Lines         689      689           
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  Hits          503      503           
  Misses        186      186           

Impacted Files	Coverage Δ
ext/ComponentArraysGPUArraysExt.jl	52.88% <ø> (ø)

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[jonniedie]

Thanks for this! It looks like the test failure is unrelated, so I'm gonna fix that really quick.

[jonniedie]

Okay, this should be good to go with the new changes. If you wouldn't mind rebasing I can merge after that.