sage.rings.abc: Add pAdicRing, pAdicField; deprecate is_pAdic... #32750
Description
This change will allow use to eliminate imports from sage.rings.padics in sage.rings.polynomial.polynomial_element.
Part of Meta-ticket #32414.
Depends on #32665
CC: @EnderWannabe @bhutz
Component: refactoring
Author: Matthias Koeppe, Alexander Galarraga
Branch/Commit: 03b24bd
Reviewer: Jonathan Kliem
Issue created by migration from https://trac.sagemath.org/ticket/32750