In this ticket we finalize the implementation of lazy series, and replace the old lazy series framework.

Depends on #34423

CC: @mantepse @tscrim @pfili @zimmermann6 @sagetrac-tmonteil

Component: combinatorics

Keywords: LazyPowerSeries, FormalSeries, gsoc2021

Author: Tejasvi Chebrolu, Martin Rubey, Travis Scrimshaw

Branch/Commit: 4fc981b

Reviewer: Martin Rubey, Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/32367