A pool is often seen as one of the simplest perks of condo living. But at one New Jersey community, residents say access to that shared amenity has become sharply divided. At The Club at Jackson 21 in Ocean County, homeowners have lodged discrimination complaints over a pool schedule that sets aside roughly 75% of the available swim time for separate men's and women's hours. What happened? Residents from the 465-townhome community told New Jerse…