ORM: add EnumData plugin to to_aiida_type dispatch

[sphuber]

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[codecov]

Codecov Report

Merging #5314 (29fd4cf) into develop (d9f8c85) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #5314      +/-   ##
===========================================
+ Coverage    82.02%   82.02%   +0.01%     
===========================================
  Files          533      533              
  Lines        38255    38259       +4     
===========================================
+ Hits         31373    31377       +4     
  Misses        6882     6882              

Flag	Coverage Δ
django	77.07% <100.00%> (-<0.01%)	⬇️
sqlalchemy	76.34% <100.00%> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
aiida/orm/nodes/data/enum.py	100.00% <100.00%> (ø)

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[mbercx]

Looks good, thanks for giving me a reason to find out what a single dispatch generic function is. :)