[identity] build API register/login base on RFC https://tools.ietf.org/html/rfc7519

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Using this library to generate token https://github.com/dgrijalva/jwt-go

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Check this open source https://www.ory.sh/hydra/docs/#:~:text=Hydra%20is%20an%20OAuth%202.0,the%20name%20of%20your%20users.