Initial implementations of Weyl and Clifford algebras.

Depends on #16037

CC: @darijgr @sagetrac-sage-combinat

Component: algebra

Keywords: days54

Author: Travis Scrimshaw

Branch/Commit: ff27bdc

Reviewer: Darij Grinberg, John Palmieri

Issue created by migration from https://trac.sagemath.org/ticket/15300