By Elizabeth Piper and Andrew MacAskill LONDON (Reuters) – Prime Minister Boris Johnson promised on Tuesday to revive Britain’s economic growth to help those struggling with a cost-of-living crisis and to tackle regional inequalities after setting out his government’s agenda for the coming months. Punished by voters in last week’s local elections over COVID lockdown-related scandals and soaring inflation, Johnson said his ruling Conservative Party would “deliver on the promises we made” in the 2019 election. The plans, contained in the Queen’s Speech, were read out at the ceremonial State Open…