[ENH] Added function to plot models to Liquid Earth API

This update introduces a new function 'plot_to_liquid_earth' allowing geology models to be visualized via the Liquid Earth API. This feature supports both existing and new spaces. Also, token handling has been improved, where tokens can now be retrieved directly from the system environment variables. Tests and documentation in the tutorial also have been updated accordingly.

Author: Leguark

examples/tutorials/ch1_fundamentals/ch1_7_3d_visualization.py

@@ -54,7 +54,7 @@
 # %%
 
 # sphinx_gallery_thumbnail_number = 2
-gpv = gpv.plot_3d(
+plot_3d = gpv.plot_3d(
     model=geo_model,
     plotter_type='basic',
     off_screen=False,
@@ -63,3 +63,15 @@
     show_lith=True,
     kwargs_plot_structured_grid={'opacity': .5}
 )
+
+# %%
+link = gpv.plot_to_liquid_earth(
+    geo_model=geo_model,
+    space_name="new_space_name",
+    file_name="gempy_model",
+    user_token=None,  # If None, it will try to grab it from the environment
+    grab_link=True
+)
+
+print(link)
+link