Cleanup importlib code

[vstinner]

BPO	42403
Nosy	@vstinner
PRs	bpo-42403: Use @staticmethod in importlib #23395 bpo-42403: Fix pyflakes warnings in importlib #23396 bpo-42403: Simplify importlib external bootstrap #23397

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2020-11-20.13:56:06.909>
created_at = <Date 2020-11-19.08:37:24.060>
labels = ['library', '3.10']
title = 'Cleanup importlib code'
updated_at = <Date 2020-11-20.13:56:06.908>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2020-11-20.13:56:06.908>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2020-11-20.13:56:06.909>
closer = 'vstinner'
components = ['Library (Lib)']
creation = <Date 2020-11-19.08:37:24.060>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 42403
keywords = ['patch']
message_count = 5.0
messages = ['381397', '381401', '381408', '381479', '381480']
nosy_count = 1.0
nosy_names = ['vstinner']
pr_nums = ['23395', '23396', '23397']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue42403'
versions = ['Python 3.10']

[vstinner]

Placeholder issuer to enhance the importlib code base and "bootstrap" code.

[vstinner]

New changeset 7d9d25d by Victor Stinner in branch 'master':
bpo-42403: Fix pyflakes warnings in importlib (GH-23396)
7d9d25d

[vstinner]

New changeset 3390347 by Victor Stinner in branch 'master':
bpo-42403: Simplify importlib external bootstrap (GH-23397)
3390347

[vstinner]

New changeset 3be8e22 by Victor Stinner in branch 'master':
bpo-42403: Use @staticmethod in importlib (GH-23395)
3be8e22

[vstinner]

I tried to rework how importlib/_bootstrap.py is imported and rework importlib/init.py code which imports _bootstrap.py and _bootstrap_external.py, but I introduced bugs. I prefer to leave the code as it is.

At least, _bootstrap_external.py is now able to use regular imports (for builtin modules) rather than requiring to inject modules afterwards.