Read the GBIF enums from the API endpoints

[tpoisot]

This removes any issue with keeping the enums up to date.

[github-actions]

Documentation for this PR at https://poisotlab.github.io/SpeciesDistributionToolkit.jl/previews/PR170/

[codecov-commenter]

Codecov Report

Patch coverage: 10.52% and project coverage change: -0.63 ⚠️

Comparison is base (39a871e) 48.56% compared to head (4929906) 47.93%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #170      +/-   ##
==========================================
- Coverage   48.56%   47.93%   -0.63%     
==========================================
  Files          36       37       +1     
  Lines        1219     1235      +16     
==========================================
  Hits          592      592              
- Misses        627      643      +16     

Flag	Coverage Δ
unittests	47.93% <10.52%> (-0.63%)	⬇️

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Impacted Files	Coverage Δ
GBIF/src/GBIF.jl	0.00% <0.00%> (ø)
GBIF/src/query.jl	80.00% <ø> (ø)
src/pseudoabsences.jl	0.00% <ø> (ø)
src/integrations/datasets_layers.jl	72.00% <50.00%> (ø)
GBIF/src/occurrence.jl	90.00% <100.00%> (ø)

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