By Jeffrey Dastin (Reuters) -Amazon.com Inc is planning to lay off around 10,000 employees in corporate and technology roles beginning this week, a person familiar with the matter said on Monday, in what would amount to its biggest such reduction to date. The cuts, earlier reported by the New York Times, would represent about 3% of Amazon’s corporate staff. The exact number may vary as businesses within Amazon review their priorities, the source told Reuters. The online retailer plans to eliminate jobs in its devices organization, which makes voice-controlled “Alexa” gadgets and home-security …