feat: add geospatial Julia packages to rocker-rpyjl (#130)

Install the core JuliaGeo ecosystem packages along with plotting and
data-handling packages into the rocker-rpyjl image so the Julia side ships
with geospatial support out of the box (grouped by role — interfaces,
geometry ops, vector I/O, raster/gridded data, tabular, plotting):

GeoInterface, GeoFormatTypes, Extents, GeometryOps, LibGEOS, ArchGDAL,
GeoDataFrames, Shapefile, GeoJSON, GeoParquet, Rasters, NCDatasets,
ZarrDatasets, GRIBDatasets, DataFrames, CSV, Plots, Makie, CairoMakie.

Resurrects #74 (closed as stale), rebased on current master.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: asinghvi17

rocker-rpyjl/Dockerfile

@@ -1,3 +1,4 @@
 FROM ghcr.io/geocompx/rocker-rpy
 RUN /rocker_scripts/install_julia.sh
 RUN R -e "install.packages('JuliaCall')"
+RUN julia -e 'using Pkg; Pkg.add(["GeoInterface", "GeoFormatTypes", "Extents", "GeometryOps", "LibGEOS", "ArchGDAL", "GeoDataFrames", "Shapefile", "GeoJSON", "GeoParquet", "Rasters", "NCDatasets", "ZarrDatasets", "GRIBDatasets", "DataFrames", "CSV", "Plots", "Makie", "CairoMakie"])'