The long-vacant BGE Pavilion in the Inner Harbor’s Rash Field Park finally has a tenant. Baltimore’s Board of Estimates on Wednesday approved the lease for OneDo Coffee Roasters to take up the 1,156-square-foot space, with an expected opening next spring. The introduction of the Canton-based coffee shop gives visitors of the nearby Maryland Science Center another dining option. It plans to offer hand-crafted coffees and teas, sandwiches and salads.