[lldb/Plugins] Add Attach capabilities to ScriptedProcess

This patch adds process attach capabilities to the ScriptedProcess
plugin. This doesn't really expects a PID or process name, since the
process state is already script, however, this allows to create a
scripted process without requiring to have an executuble in the target.

In order to do so, this patch also turns the scripted process related
getters and setters from the `ProcessLaunchInfo` and
`ProcessAttachInfo` classes to a `ScriptedMetadata` instance and moves
it in the `ProcessInfo` class, so it can be accessed interchangeably.

This also adds the necessary SWIG wrappers to convert the internal
`Process{Attach,Launch}InfoSP` into a `SB{Attach,Launch}Info` to pass it
as argument the scripted process python implementation and convert it
back to the internal representation.

rdar://104577406

Differential Revision: https://reviews.llvm.org/D143104

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

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

@@ -15,7 +15,6 @@
 // LLDB Python header must be included first
 #include "lldb-python.h"
 
-#include "SWIGPythonBridge.h"
 #include "ScriptInterpreterPythonImpl.h"
 #include "ScriptedPythonInterface.h"
 #include <optional>
@@ -71,6 +70,36 @@ ScriptedPythonInterface::ExtractValueFromPythonObject<lldb::DataExtractorSP>(
   return m_interpreter.GetDataExtractorFromSBData(*sb_data);
 }
 
+template <>
+lldb::ProcessAttachInfoSP ScriptedPythonInterface::ExtractValueFromPythonObject<
+    lldb::ProcessAttachInfoSP>(python::PythonObject &p, Status &error) {
+  lldb::SBAttachInfo *sb_attach_info = reinterpret_cast<lldb::SBAttachInfo *>(
+      LLDBSWIGPython_CastPyObjectToSBAttachInfo(p.get()));
+
+  if (!sb_attach_info) {
+    error.SetErrorString(
+        "Couldn't cast lldb::SBAttachInfo to lldb::ProcessAttachInfoSP.");
+    return nullptr;
+  }
+
+  return m_interpreter.GetOpaqueTypeFromSBAttachInfo(*sb_attach_info);
+}
+
+template <>
+lldb::ProcessLaunchInfoSP ScriptedPythonInterface::ExtractValueFromPythonObject<
+    lldb::ProcessLaunchInfoSP>(python::PythonObject &p, Status &error) {
+  lldb::SBLaunchInfo *sb_launch_info = reinterpret_cast<lldb::SBLaunchInfo *>(
+      LLDBSWIGPython_CastPyObjectToSBLaunchInfo(p.get()));
+
+  if (!sb_launch_info) {
+    error.SetErrorString(
+        "Couldn't cast lldb::SBLaunchInfo to lldb::ProcessLaunchInfoSP.");
+    return nullptr;
+  }
+
+  return m_interpreter.GetOpaqueTypeFromSBLaunchInfo(*sb_launch_info);
+}
+
 template <>
 std::optional<MemoryRegionInfo>
 ScriptedPythonInterface::ExtractValueFromPythonObject<