Add Nedelec edge elements of type I and order 1

Nedelec elements [1] are implemented in class N1E1VectorFunction. They are useful for problems in H(curl). The notation follows the Periodic Table of the Finite Elements [2]. Additionally, the hybrid smoother by Hiptmair [3] is implemented.

[1] J. C. Nedelec, “Mixed finite elements in ℝ3,” Numer. Math., vol. 35, no. 3, pp. 315–341, Sep. 1980, doi: 10.1007/BF01396415.
[2] D. N. Arnold and A. Logg, “Periodic Table of the Finite Elements,” SIAM News, Nov. 2014. Accessed: Jul. 04, 2022. [Online]. Available: https://www-users.cse.umn.edu/~arnold/femtable
[3] R. Hiptmair, “Multigrid Method for Maxwell’s Equations,” SIAM J. Numer. Anal., vol. 36, no. 1, pp. 204–225, Jan. 1998, doi: 10.1137/S0036142997326203.