feat: implement `car/cdr` (`first/rest`) operations on lists

[daoio]

Overview

E.g.:

(storage 
  (:external (
    (def numbers (list u256))  
)))

(functions 
  (:external
    ;; Returns [:1] elements from `numbers`
    (defn firstElement () (@sto :w 0 :r 1) (-> ((f mut u256))) 
        (-> f (first (sto read! numbers)))

    ;; Returns [1:] elements from `numbers`
    (defn restElements () (@sto :w 0 :r 1) (-> ((r mut u256))) 
        (-> f (rest (sto read! numbers)))
))