CLEARWATER, Fla. — Move over, Steve Cohen. There’s another big spender in the National League East. John Middleton, frontman for the Phillies’ ownership group, bellied up to the billionaires’ bar here late Friday night and plunked down a cool $100 million to win the bidding on a five-year contract for free-agent outfielder Nick Castellanos, a major league source said, confirming reports by Audacy Sports and ESPN.com. The Phillies haven’t announced the deal because it’s pending a physical. But it represents a stunning wallet flex only two nights after the team agreed to a four-year, $79 million…
