Currently, Stream_function and Stream_map_coefficient depend on a ring argument, which seems unnecessary, and which we therefore remove.

Depends on #34413

CC: @tscrim

Component: combinatorics

Keywords: LazyPowerSeries

Author: Martin Rubey

Branch/Commit: f69c2de

Reviewer: Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/34473