We add a function to compute the dynamical Arakelov-Zhang pairing of two rational maps defined over number fields.

Depends on #28779

CC: @sagetrac-hkrieger @yuankmath @bhutz @EnderWannabe

Component: dynamics

Keywords: sd104, gsoc2022

Author: Paul Fili, Holly Krieger, Jing Guo

Branch/Commit: 9ce8f81

Reviewer: Alexander Galarraga

Issue created by migration from https://trac.sagemath.org/ticket/21129