The $100 billion Congress allocated for hospitals and health-care providers in its $2 trillion coronavirus rescue bill has been slow to go out and has shortchanged some of the places that need it most, lawmakers and industry groups say. They also say the total sum is woefully inadequate to address the needs created by the virus, which has overwhelmed big-city hospitals even as some providers have experienced a precipitous loss in revenue from elective procedures that has forced them to lay people off in the middle of a raging pandemic.