The Bronx Bombers and their big spending boss, George Steinbrenner, are closin in on a deal with city and state officials to build a gleaming new Yankee Stadium in a park next to the House that Ruth Built. The team is in the final sages of planning for a new $700 million "state of the art" stadium, a source close to the Yankees said yesterday. But the team denied a story in Crain's New york Business that an announcement can be expected in the next two weeks.