[lldb] Introduce ScriptedFrame affordance (#149622)

This patch introduces a new scripting affordance in lldb:
`ScriptedFrame`.

This allows user to produce mock stackframes in scripted threads and
scripted processes from a python script.

With this change, StackFrame can be synthetized from different sources:
- Either from a dictionary containing a load address, and a frame index,
  which is the legacy way.
- Or by creating a ScriptedFrame python object.

One particularity of synthezising stackframes from the ScriptedFrame
python object, is that these frame have an optional PC, meaning that
they don't have a report a valid PC and they can act as shells that just
contain static information, like the frame function name, the list of
variables or registers, etc. It can also provide a symbol context.

rdar://157260006

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

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

lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp

@@ -1521,6 +1521,11 @@ ScriptInterpreterPythonImpl::CreateScriptedThreadInterface() {
   return std::make_shared<ScriptedThreadPythonInterface>(*this);
 }
 
+ScriptedFrameInterfaceSP
+ScriptInterpreterPythonImpl::CreateScriptedFrameInterface() {
+  return std::make_shared<ScriptedFramePythonInterface>(*this);
+}
+
 ScriptedThreadPlanInterfaceSP
 ScriptInterpreterPythonImpl::CreateScriptedThreadPlanInterface() {
   return std::make_shared<ScriptedThreadPlanPythonInterface>(*this);