[lldb] Make use of Scripted{Python,}Interface for ScriptedThreadPlan (#70392)

This patch makes ScriptedThreadPlan conforming to the ScriptedInterface
& ScriptedPythonInterface facilities by introducing 2
ScriptedThreadPlanInterface & ScriptedThreadPlanPythonInterface classes.

This allows us to get rid of every ScriptedThreadPlan-specific SWIG
method and re-use the same affordances as other scripting offordances,
like Scripted{Process,Thread,Platform} & OperatingSystem.

To do so, this adds new transformer methods for `ThreadPlan`, `Stream` &
`Event`, to allow the bijection between C++ objects and their python
counterparts.

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

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

@@ -224,6 +224,10 @@ protected:
     return python::SWIGBridge::ToSWIGWrapper(arg);
   }
 
+  python::PythonObject Transform(lldb::ThreadPlanSP arg) {
+    return python::SWIGBridge::ToSWIGWrapper(arg);
+  }
+
   python::PythonObject Transform(lldb::ProcessAttachInfoSP arg) {
     return python::SWIGBridge::ToSWIGWrapper(arg);
   }
@@ -232,6 +236,14 @@ protected:
     return python::SWIGBridge::ToSWIGWrapper(arg);
   }
 
+  python::PythonObject Transform(Event *arg) {
+    return python::SWIGBridge::ToSWIGWrapper(arg);
+  }
+
+  python::PythonObject Transform(Stream *arg) {
+    return python::SWIGBridge::ToSWIGWrapper(arg);
+  }
+
   python::PythonObject Transform(lldb::DataExtractorSP arg) {
     return python::SWIGBridge::ToSWIGWrapper(arg);
   }
@@ -329,6 +341,14 @@ template <>
 Status ScriptedPythonInterface::ExtractValueFromPythonObject<Status>(
     python::PythonObject &p, Status &error);
 
+template <>
+Event *ScriptedPythonInterface::ExtractValueFromPythonObject<Event *>(
+    python::PythonObject &p, Status &error);
+
+template <>
+Stream *ScriptedPythonInterface::ExtractValueFromPythonObject<Stream *>(
+    python::PythonObject &p, Status &error);
+
 template <>
 lldb::BreakpointSP
 ScriptedPythonInterface::ExtractValueFromPythonObject<lldb::BreakpointSP>(