(Reuters) – Wicketkeeper Joshua Da Silva scored a maiden test century as West Indies earned an invaluable first-innings lead of 93 runs over England on day three of the deciding test of the series in Grenada on Saturday. In an extraordinary morning session, West Indies added 65 runs to their overnight total after resuming play with a lead of 28 and with two wickets in hand. It took more than two hours for a frustrated England to finally prise them out for a total of 297 as the match started to slip away. Da Silva, looking far more capable with the bat than your average No. 8, added 46 runs to …