Add support for the enw arguments in Redis 6.2 for COMMAND INFO as specified at https://redis.io/commands/COMMAND-INFO.

Detail of update: Allowed to be called with no argument to get info on all commands.

This is part of #820.
Note: Due to the autogenerated nature of this, some of this may be already implemented.