[lldb/CommandInterpreter] Move everything into CommandInterpreterRunOptions

This implements Greg's suggestion from D78825 to include "auto handle
events" and "spawn thread" in CommandInterpreterRunOptions. This change
is in preparation for adding a new overload for RunCommandInterpreter
that takes only SBCommandInterpreterRunOptions and returns
SBCommandInterpreterRunResults.

Differential revision: https://reviews.llvm.org/D79108