[lldb/Plugins] Add ScriptedProcess::GetThreadsInfo interface

This patch adds a new method to the Scripted Process interface to
retrive a dictionary of Scripted Threads. It uses the thread ID as a key
and the Scripted Thread instance as the value.

This dictionary will be used to create Scripted Threads in lldb and
perform calls to the python scripted thread object.

rdar://87427126

Differential Revision: https://reviews.llvm.org/D117068

Signed-off-by: Med Ismail Bennani <medismail.bennani@gmail.com>

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

@@ -92,6 +92,17 @@ ScriptedProcessPythonInterface::GetMemoryRegionContainingAddress(
   return mem_region;
 }
 
+StructuredData::DictionarySP ScriptedProcessPythonInterface::GetThreadsInfo() {
+  Status error;
+  StructuredData::DictionarySP dict =
+      Dispatch<StructuredData::DictionarySP>("get_threads_info", error);
+
+  if (!CheckStructuredDataObject(LLVM_PRETTY_FUNCTION, dict, error))
+    return {};
+
+  return dict;
+}
+
 StructuredData::DictionarySP
 ScriptedProcessPythonInterface::GetThreadWithID(lldb::tid_t tid) {
   Status error;