[ENH] Simplify 3D visualization code and start LiquidEarth integration

Refactored the 3D visualization code in the tutorials to make it simpler. Initiated the process of integrating the LiquidEarth API into the gemPy3 software. Also adjusted API tests to reflect changes in property names and request methods.

Author: Leguark

WhatsNewGemPy3.md

@@ -34,7 +34,7 @@ We've overhauled the foundation of GemPy to ensure:
 
 **6. Dual Contouring for High-Quality Meshing**
 
-**7. External Implicit Interpolation Function**
+**7. First steps LiquidEarth Integration**
 
 **And Much More!**
 

examples/tutorials/ch1_fundamentals/ch1_7_3d_visualization.py

@@ -52,19 +52,10 @@
 gpv.plot_3d(geo_model, image=False)
 
 # %%
-
 # sphinx_gallery_thumbnail_number = 2
-plot_3d = gpv.plot_3d(
-    model=geo_model,
-    plotter_type='basic',
-    off_screen=False,
-    show_topography=True,
-    show_scalar=False,
-    show_lith=True,
-    kwargs_plot_structured_grid={'opacity': .5}
-)
 
 # %%
+# TODO Add explanation
 link = gpv.plot_to_liquid_earth(
     geo_model=geo_model,
     space_name="new_space_name",