Function try_read_vector

@TODO use nom functions in place of macro Tries to parse &str into Value::PersistentVector Example Successes: [1 2 3] => Value::PersistentVector(PersistentVector { vals: [Rc(Value::I32(1) ... ]}) [1 2 [5 10 15] 3] => Value::PersistentVector(PersistentVector { vals: [Rc(Value::I32(1) .. Rc(Value::PersistentVector..)]})

(input: &str)