User Service

[slhmy]

1. User RPC Service.
2. Web UI & API with GitHub login, generate session & JWT token for further requests.
3. Management Dashboard, we can set site admin role for the user, with such role user can access admin interface.

Related Issues

1. Enforcer in AuthInterceptor user-service#1
2. Session refreshing reference user-service#2

Questions

1. If the following logic should be placed in session middleware:
   

   reborn/internal/handlers/user.go

   Lines 65 to 68 in 46a4d2f

   	md := metadata.Pairs("authorization", "Bearer "+userToken)
   	ctx := metadata.NewOutgoingContext(c.Request().Context(), md)
   	// Get current user information
   	user, err := userServiceClient.GetCurrentUser(ctx, &emptypb.Empty{})