By Sarah Jean Callahan Target has an answer for Amazon’s Prime Day and consumers will be the winners. Competing against Amazon (AMZN) – Get Amazon.com Inc. Report is not easy for rival retailers as it projects its Prime service to have 152 million users in 2022. The online retail giant’s subscriber base is also a key to its success with its annual sales event Prime Day. Walmart (WMT) – Get Walmart Inc. Report made a play to challenge Amazon Prime Day with its Walmart+ subscriber base, which amounted to 32 million subscribers in 2021, as it rolled out Walmart+ Weekend on June 2. Now, Target (TG…