Support ZINTERCARD

[heka1024]

Resolves: #3253

Similar to SINTERCARD, It would be nice if we can provide same operation for zset.

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[mp911de]

Care to add ZINTERCARD for the reactive API as well? Also, there should be also tests on the connection level to verify proper functionality of the ZINTERCARD on the Jedis/JedisCluster/Lettuce Connection-level.