iitem – Multiple level of lists in one list-like environment

The package defines multiple level lists within one list-like environment. instead of writing

   \begin{enumerate}
    \item 1
    \begin{enumerate}
    \item 2
    \begin{enumerate}
    \item 3
    \begin{enumerate}
    \item 4
    \end{enumerate}
    \end{enumerate}
    \item 2.1
    \end{enumerate}
    \item 1.1
    \begin{enumerate}
    \item 2
    \end{enumerate}
    \end{enumerate}
  

  \begin{enumerate}
   \item 1
   \iitem 2
   \iiitem 3
   \ivtem 4
   \iitem 2.1
   \item 1.1
   \iitem 2
  \end{enumerate}
  

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