TAMPA, Fla. — Luis Severino has made it clear he prefers to be a starting pitcher. Through a lat injury and Tommy John rehab, Severino’s goal was always to get back on the mound and stretch out enough to get deep into games. This winter has been no exception. “I am working out, throwing bullpens, getting ready,” Severino said after the players’ union meeting here last week. When asked specifically about his role, Severino was beginning to get stretched out to start. “That’s the plan. I had been a reliever [at the end of last season], but I am a starter. So that’s the plan, stretch out as best …