NewBadRequestError : this method implements the bad request error.

NewError : this will creates the New Error.

NewInternalServerError : this method implements the internal server error.

NewNotFoundError : this method implements the not found error.

NewRestErrorFromBytes : creates the resterror domain by taking the paramter as a slice of bytes.

NewUnauthorizedError : this method implements the unauthorized error.

TokenExpired : this will return when the token get expired.

RestError : this hold the signature of the function.