Add support for terra package

[dieghernan]

Closes #91

This PR adds specific methods for "SpatRaster" objects created with the terra package. Additionally:

• GH Actions updated following https://github.com/r-lib/actions/tree/master/.github/workflows
• I think there is an odd bug on the implementation of dpi for layer_spatial,Raster. If the parameter is specified on layer_spatial the Geom* method doesn't capture it. However if passed via ... it is captured. This have been corrected on layer_spatial,SpatRaster and I added a test to check it.
• Tests and snapshots addeed for the new functions.

ping @rhijmans

[codecov-commenter]

Codecov Report

Merging #92 (b814c2a) into master (162df0f) will increase coverage by 1.02%. The diff coverage is 79.18%.

@@            Coverage Diff             @@
##           master      #92      +/-   ##
==========================================
+ Coverage   81.87%   82.89%   +1.02%     
==========================================
  Files          19       21       +2     
  Lines        1131     1298     +167     
==========================================
+ Hits          926     1076     +150     
- Misses        205      222      +17     

Impacted Files	Coverage Δ
R/layer-spatial-stars.R	0.00% <0.00%> (ø)
R/layer-spatial.R	100.00% <ø> (ø)
R/layer-spatial-terra.R	90.17% <90.17%> (ø)
R/annotation-map-tile.R	100.00% <100.00%> (ø)
R/annotation-north-arrow.R	100.00% <100.00%> (ø)
R/df-spatial-raster.R	100.00% <100.00%> (ø)
R/df-spatial-sf.R	86.36% <100.00%> (ø)
R/df-spatial-terra.R	100.00% <100.00%> (ø)
R/layer-spatial-raster.R	70.86% <100.00%> (+9.05%)	:arrow_up:
R/longlake-data.R	100.00% <100.00%> (ø)
... and 1 more

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[dieghernan]

Hi @paleolimbot ,

I am sure you are already aware, but the error is due to some resources not available on RSPM. I changed the tests so they don't use RSPM any more.

See here the latests results on my repo: https://github.com/dieghernan/ggspatial/actions/workflows/R-CMD-check.yaml

[paleolimbot]

Thank you! Sorry for the delay...I wanted to make sure I spent the time to walk through the examples.