By Frank Dalleres Chelsea raised eyebrows today when they announced the signing of French defender Benoit Badiashile on a mammoth seven-and-a-half-year contract. Players typically agree deals for three, four or five years but the contract handed to Badiashile, who joins from Monaco for a fee of £33m, runs into the next decade. However, the length of the deal could help Chelsea to continue their extravagant spending without falling foul of financial fair play rules. How will Badiashile’s long contract help with financial fair play?Whether the Premier League’s or European governing body Uefa’s, …