Add GBIF/Phylopic integration

[tpoisot]

• add the integration between Phylopic and GBIF, Closes Phylopic/GBIF integration #175
• add raster download to Phylopic, Closes Add method to download the high-res png #171
• new release of SpeciesDistributionToolkit
• new release of Phylopic
• update the documentation

[github-actions]

Documentation for this PR at https://poisotlab.github.io/SpeciesDistributionToolkit.jl/previews/PR179/

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -7.43 ⚠️

Comparison is base (6367411) 53.27% compared to head (6c74d84) 45.84%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #179      +/-   ##
==========================================
- Coverage   53.27%   45.84%   -7.43%     
==========================================
  Files          53       43      -10     
  Lines        1633     1361     -272     
==========================================
- Hits          870      624     -246     
+ Misses        763      737      -26     

Flag	Coverage Δ
unittests	45.84% <0.00%> (-7.43%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
Phylopic/src/images.jl	0.00% <0.00%> (ø)
src/integrations/gbif_phylopic.jl	0.00% <0.00%> (ø)

... and 11 files with indirect coverage changes

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