Brew Hub Tap Room(5656 Oakland Avenue, 314-833-5453), which opened Friday in the Cheltenham neighborhood just across from Forest Park, has 25 taps full of beer you can't get anywhere else in St. Louis. That's not just a selling point — it's the concept's entire raison d'etre.Founded by former Anheuser-Busch executive Tim Schoen, St. Louis-based Brew Hub serves as a partner for craft breweries, doing the brewing, packaging, distribution and selling for brands that want to expand their footprint and need a partner to do it.…