- Create CSharpScript for generic C# types.
- `ScriptPathAttributeGenerator` registers the path for the generic type definition.
- `ScriptManagerBridge` lookup uses the generic type definition that was registered by the generator.
- Constructed generic types use a virtual `csharp://` path so they can be registered in the map and loaded as if there was a different file for each constructed type, even though they all share the same real path.
- This allows getting the base type for a C# type that derives from a generic type.
- Shows base scripts in the _Add Node_ and _Create Resource_ dialogs even when they are generic types.
- `get_global_class_name` implementation was moved to C# and now always returns the base type even if the script is not a global class (this behavior matches GDScript).
- Create `CSharpScript::TypeInfo` struct to hold all the type information about the C# type that corresponds to the `CSharpScript`, and use it as the parameter in `UpdateScriptClassInfo` to avoid adding more parameters.
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