Update User by Email
PATCH http://localhost:8080/users/updateUserByEmail/konst@eleni.gr
Request Body
[{"name"=>"firstname", "value"=>"Eleni", "datatype"=>"string"}, {"name"=>"lastname", "value"=>"Konstantinidou", "datatype"=>"string"}, {"name"=>"phonenumber", "value"=>"6923456781", "datatype"=>"number"}, {"name"=>"email", "value"=>"", "datatype"=>"null"}]