* Implement/test LOLWUT command

https://redis.io/commands/lolwut

This is a lot of fun to play with:

```python
>>> from redis import Redis
>>> redis = Redis()
>>> print(redis.lolwut(5, 6, 7, 8).decode('utf-8'))
⣴⣶⣶⣶⣶⡆
⣿⣿⣿⣿⣿⡇
⠹⡿⠟⣿⡿⠃
⠀⠀⠀⠀⠀⠀
Georg Nees - schotter, plotter on paper, 1968. Redis ver. 6.0.10

>>> print(redis.lolwut(5, 6, 7, 8).decode('utf-8'))
⢰⣶⣶⣶⣶⡆
⢿⣿⣿⣿⣿⠁
⠸⡿⢿⠿⡿⠃
⠀⠀⠀⠀⠀⠀
Georg Nees - schotter, plotter on paper, 1968. Redis ver. 6.0.10

>>> print(redis.lolwut(5, 6, 7, 8).decode('utf-8'))
⢰⣶⣶⣶⣶⡆
⣸⣿⣿⣻⣿⡅
⠿⡿⠻⠿⠿⠁
⠀⠀⠀⠀⠀⠀
Georg Nees - schotter, plotter on paper, 1968. Redis ver. 6.0.10

>>>
```

* Add link to LOLWUT command documentation

Co-authored-by: Chayim <chayim@users.noreply.github.com>

* Skip LOLWUT unit test for Redis < 5.0.0

The `LOLWUT` command was introduced in Redis 5.0.0:
https://redis.io/commands/lolwut

Co-authored-by: Chayim <chayim@users.noreply.github.com>