By Philip Blenkinsop and Kate Abnett BRUSSELS (Reuters) -European Commission President Ursula von der Leyen will suggest to EU leaders meeting this week how the EU could cap gas prices in a bid to contain soaring energy costs. EU governments have debated a gas price cap for weeks, without reaching agreement. While a majority of EU members support some form of cap to tackle soaring inflation, Germany, Denmark and the Netherlands are opposed, citing concerns over security of supply. The EU executive’s chief laid out her proposals in a letter on Wednesday to EU country leaders, who will discuss w…