[lldb/Interpreter] Make ScriptedInterface Object creation more generic (#68052)

This patch changes the way plugin objects used with Scripted Interfaces
are created.

Instead of implementing a different SWIG method to create the object for
every scripted interface, this patch makes the creation more generic by
re-using some of the ScriptedPythonInterface templated Dispatch code.

This patch also improves error handling of the object creation by
returning an `llvm::Expected`.

Signed-off-by: Med Ismail Bennani <ismail@bennani.ma>

Signed-off-by: Med Ismail Bennani <ismail@bennani.ma>

lldb/source/Plugins/ScriptInterpreter/Python/Interfaces/ScriptedThreadPythonInterface.h

@@ -23,7 +23,7 @@ class ScriptedThreadPythonInterface : public ScriptedThreadInterface,
 public:
   ScriptedThreadPythonInterface(ScriptInterpreterPythonImpl &interpreter);
 
-  StructuredData::GenericSP
+  llvm::Expected<StructuredData::GenericSP>
   CreatePluginObject(llvm::StringRef class_name, ExecutionContext &exe_ctx,
                      StructuredData::DictionarySP args_sp,
                      StructuredData::Generic *script_obj = nullptr) override;