Add the ability for Script based commands to specify their "repeat command" (#94823)

Among other things, returning an empty string as the repeat command
disables auto-repeat, which can be useful for state-changing commands.

There's one remaining refinement to this setup, which is that for parsed
script commands, it should be possible to change an option value, or add
a new option value that wasn't originally specified, then ask lldb "make
this back into a command string". That would make doing fancy things
with repeat commands easier.

That capability isn't present in the lldb_private side either, however.
So that's for a next iteration.

I haven't added this to the docs on adding commands yet. I wanted to
make sure this was an acceptable approach before I spend the time to do
that.

lldb/bindings/python/python-wrapper.swig

@@ -728,6 +728,28 @@ bool lldb_private::python::SWIGBridge::LLDBSwigPythonCallCommandObject(
   return true;
 }
 
+std::optional<std::string>
+lldb_private::python::SWIGBridge::LLDBSwigPythonGetRepeatCommandForScriptedCommand(PyObject *implementor,
+                                               std::string &command) {
+  PyErr_Cleaner py_err_cleaner(true);
+
+  PythonObject self(PyRefType::Borrowed, implementor);
+  auto pfunc = self.ResolveName<PythonCallable>("get_repeat_command");
+  // If not implemented, repeat the exact command.
+  if (!pfunc.IsAllocated())
+    return std::nullopt;
+
+  PythonString command_str(command);
+  PythonObject result = pfunc(command_str);
+
+  // A return of None is the equivalent of nullopt - means repeat
+  // the command as is:
+  if (result.IsNone())
+    return std::nullopt;
+
+  return result.Str().GetString().str();
+}
+
 #include "lldb/Interpreter/CommandReturnObject.h"
 
 bool lldb_private::python::SWIGBridge::LLDBSwigPythonCallParsedCommandObject(