Added SADD test variations discussed in redis/pull/11595

[filipecosta90]

As being discussed in redis/redis#11595 (comment)

[zuiderkwast]

Nice.

Although this benchmark is perhaps only useful for one PR. Every optimization needs its own special benchmark to prove it. What's your thoughts about that?

[filipecosta90]

Nice.

Although this benchmark is perhaps only useful for one PR. Every optimization needs its own special benchmark to prove it. What's your thoughts about that?

Nice.

Although this benchmark is perhaps only useful for one PR. Every optimization needs its own special benchmark to prove it. What's your thoughts about that?

@zuiderkwast IMO it will still be useful to track SADD performance on a general benchmark ( we don't have specific sadd benchmarks on this spec yet ). So, lets add it :)