Fix hide global class error and add .uid for Godot 4

[HaruYou27]

Godot docs
Using both class_name and add_custom_type() will cause hide global script errors.
Fix:

ERROR: Failed parse script res://Sphere-Forms-Godot-Plugin/addons/SphereFormsPlugin/CubeSphereMesh.gd                                            
Class "CubeSphereMesh" hides a global script class.
   at: reload_all_workspace_scripts (modules/gdscript/language_server/gdscript_workspace.cpp:233)
ERROR: Failed parse script res://Sphere-Forms-Godot-Plugin/addons/SphereFormsPlugin/OctaSphereMesh.gd
Class "OctaSphereMesh" hides a global script class.
   at: reload_all_workspace_scripts (modules/gdscript/language_server/gdscript_workspace.cpp:233)
ERROR: Failed parse script res://Sphere-Forms-Godot-Plugin/addons/SphereFormsPlugin/IcoSphereMesh.gd
Class "IcoSphereMesh" hides a global script class.