Create dt_hll.py

create the python code for the hyperloglog tabbed examples on the date types page

doctests/dt_hll.py

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+import redis
+
+# HIDE_START
+r = redis.Redis(decode_responses=True)
+# HIDE_END
+
+# REMOVE_START
+r.delete("bikes", "commuter_bikes", "all_bikes")
+# REMOVE_END
+
+# STEP_START pfadd
+res1 = r.pfadd("bikes", "Hyperion", "Deimos", "Phoebe", "Quaoar")
+print(res1)  # >>> 1
+
+res2 = r.pfcount("bikes")
+print(res2)  # >>> 4
+
+res3 = r.pfadd("commuter_bikes", "Salacia", "Mimas", "Quaoar")
+print(res3)  # >>> 1
+
+res4 = r.pfmerge("all_bikes", "bikes", "commuter_bikes")
+print(res4)  # >>> True
+
+res5 = r.pfcount("all_bikes")
+print(res5)  # >>> 6
+# STEP_END
+
+# REMOVE_START
+assert res4 == True
+# REMOVE_END