support cartographic add_points

[bjlittle]

🚀 Pull Request

Description

The PR implements the geovista.geoplotter.GeoPlotterBase.add_points method, as a convenience to pyvista.Plotter.add_points with cartographic awareness.

---

[codecov]

Codecov Report

Merging #442 (9e08aa8) into main (0948b72) will increase coverage by 0.37%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #442      +/-   ##
==========================================
+ Coverage   85.85%   86.23%   +0.37%     
==========================================
  Files          65       66       +1     
  Lines        3520     3617      +97     
==========================================
+ Hits         3022     3119      +97     
  Misses        498      498              

Files Changed	Coverage Δ
tests/geometry/test_coastlines.py	100.00% <100.00%> (ø)
tests/geoplotter/test_add_points.py	100.00% <100.00%> (ø)
tests/transform/test_transform_point.py	100.00% <100.00%> (ø)