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rust-cpython: switch logging facade from `simple_logger` to `env_logger`

Authored by Alphare.

Description

rust-cpython: switch logging facade from simple_logger to env_logger

simple_logger is just too simple. env_logger supports logging to stderr,
and logging filtering, for example, which are becoming necessary now. The
project is nicely active.

Differential Revision: https://phab.mercurial-scm.org/D8990