Hit with allegations of corruption and greed, state Sen. Dianne Wilkerson is at the center of a maze of malfeasance and an ever-widening public corruption investigation. Wilkerson, 54, a Roxbury Democrat, was arrested Tuesday on corruption charges accusing her of pocketing eight bribes totaling $23,500 from undercover operatives in exchange for her help obtaining a liquor license for a proposed nightclub and transferring public land to a fed posing as a private developer. It’s a distinct possibility that the U.S. Attorney’s Office may try and flip her to name alleged co-conspirators with a plea deal as bait.