Support author footnotes in NeurIPS template

[yuanxun-yx]

The official NeurIPS 2025 template support a \thanks footnote command:

\author{%
  David S.~Hippocampus\thanks{Use footnote for providing further information
    about author (webpage, alternative address)---\emph{not} for acknowledging
    funding agencies.} \\
  Department of Computer Science\\
  Cranberry-Lemon University\\
  Pittsburgh, PA 15213 \\
  \texttt{hippo@cs.cranberry-lemon.edu} \\
}

It would be great if this template could support this feature as well. Thank you very much!