New feature to make it possible to get a permutation from its Lehmer cocode. A function to get the Lehmer cocode of a given permutation already exists.

CC: @jessicapalencia @tscrim @mantepse

Component: combinatorics

Keywords: permutations

Author: Nadia Lafrenière

Branch/Commit: 0158e18

Reviewer: Jessica Striker, Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/34184