NEW BEDFORD — A third bidder has thrown its hat into the ring for a chance to build Massachusetts’ second commercial offshore wind farm.Mayflower Wind Energy, a joint venture of Shell and EDP Renewables, submitted a bid by the deadline, the company announced Friday.At least two other companies, Bay State Wind and Vineyard Wind, have announced they are bidding. Vineyard Wind won the first contract last year, but the project is stalled in federal permitting. [...]