speed up powers of lazy Taylor series #34350
Description
As remarked in #32324 comment:105, the computation of the square root of a lazy series is very slow.
Depends on #32324
Component: combinatorics
Keywords: LazyPowerSeries
Author: Travis Scrimshaw
Branch/Commit: b237921
Reviewer: Martin Pepin
Issue created by migration from https://trac.sagemath.org/ticket/34350