CHELMSFORD — Chelmsford is about to get a clearer picture of policing. The town’s police department will soon outfit its more than 50 officers with body‑worn cameras, a move made possible by a $122,769 state grant. The department announced on Tuesday that cameras are expected to be in use as soon as July 1, following support from officers, supervisors and all three police unions — a unified endorsement that department leaders say reflects a comm…