Support CF.MEXISTS command

[doumdoum]

No description provided.

[doumdoum]

Hi, this feature exists in redisBloom code (see unit tests) but is not yet documented, see PR RedisBloom/RedisBloom#428
Unit tests failed on a completely unrelated test :-(
Regards,
/DV

[codecov-commenter]

Codecov Report

Merging #2951 (4cb4fae) into master (44be77d) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #2951      +/-   ##
============================================
- Coverage     55.56%   55.54%   -0.02%     
  Complexity     3311     3311              
============================================
  Files           205      205              
  Lines         12718    12722       +4     
  Branches        713      713              
============================================
  Hits           7067     7067              
- Misses         5416     5420       +4     
  Partials        235      235              

Impacted Files	Coverage Δ
.../main/java/redis/clients/jedis/CommandObjects.java	66.72% <0.00%> (-0.12%)	⬇️
...rc/main/java/redis/clients/jedis/UnifiedJedis.java	55.81% <0.00%> (-0.07%)	⬇️
.../redis/clients/jedis/bloom/RedisBloomProtocol.java	0.00% <0.00%> (ø)

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