Import google-deepmind/mujoco_menagerie from GitHub. (#230)

- 1f22933 feat: Add standalone XML model for the Panda hand by Muhammad Maaz <mmaaz2005@hotmail.com>
  - 4528ba6 Add toddlerbot_2xc and toddlerbot_2xm by hshi74 <haochen213300@gmail.com>
  - eb1b112 feat: Added fr3v2 by Andreas Kuhner <andreas.kuhner@franka.de>
  - b0ee6c9 Update the PR based on the suggestions by hshi74 <haochen213300@gmail.com>
  - fe3c74a Update README.md by Haochen Shi <haochen213300@gmail.com>
  - e3b49d0 Update the PR based on the suggestions by hshi74 <haochen213300@gmail.com>
  - c1177ae Add empty lines between large blocks by hshi74 <haochen213300@gmail.com>
  - 24b360c Remove minus signs before 0s and unnecessary decimals by hshi74 <haochen213300@gmail.com>
  - b547c26 Remove unnecessary minus signs and decimals by hshi74 <haochen213300@gmail.com>
  - 3877bd1 Add the toddlerbot thumbnail by hshi74 <haochen213300@gmail.com>
  - 9304955 internal by Baruch Tabanpour <btaba@google.com>
  - a0f6f50 Add the SO101 arm to menagerie. by Baruch Tabanpour <btaba@google.com>
  - c823306 Fix png link. (#229) by btaba <btaba@google.com>

PiperOrigin-RevId: 854344968

Author: btaba