RFC improve readability of _queue_management_worker for ProcessPoolExecutor

[tomMoral]

BPO	39678
Nosy	@pitrou, @tomMoral
PRs	bpo-39678 RFC refactor queue manager thread #18551

^{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 2020-03-01.20:49:34.771>
created_at = <Date 2020-02-18.15:13:01.239>
labels = ['type-feature', 'library', '3.9']
title = 'RFC improve readability of _queue_management_worker for ProcessPoolExecutor'
updated_at = <Date 2020-03-01.20:49:34.771>
user = 'https://github.com/tomMoral'

bugs.python.org fields:

activity = <Date 2020-03-01.20:49:34.771>
actor = 'pitrou'
assignee = 'none'
closed = True
closed_date = <Date 2020-03-01.20:49:34.771>
closer = 'pitrou'
components = ['Library (Lib)']
creation = <Date 2020-02-18.15:13:01.239>
creator = 'tomMoral'
dependencies = []
files = []
hgrepos = []
issue_num = 39678
keywords = ['patch']
message_count = 2.0
messages = ['362218', '363094']
nosy_count = 2.0
nosy_names = ['pitrou', 'tomMoral']
pr_nums = ['18551']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue39678'
versions = ['Python 3.9']

[tomMoral]

As discussed in GH#17670, the the _queue_management_worker function has grown quite long and complicated.
It could be turned into an object with a bunch of short and readable helper methods.

[pitrou]

New changeset 0e89076 by Thomas Moreau in branch 'master':
bpo-39678: refactor queue manager thread (GH-18551)
0e89076